Matthew 15:18 τὰ δὲ ἐκπορευόμενα ἐκ τοῦ στόματος ἐκ τῆς καρδίας ἐξέρχεται κἀκεῖνα κοινοῖ τὸν ἄνθρωπον.
But the things which proceed out of the mouth come out of the heart, and they defile the man.
Noun: Genitive Singular Feminine

Matthew 15:19 ἐκ γὰρ τῆς καρδίας ἐξέρχονται διαλογισμοὶ, πονηροί, φόνοι, μοιχεῖαι, πορνεῖαι, κλοπαί, ψευδομαρτυρίαι, βλασφημίαι.
For out of the heart come forth evil thoughts, murders, adulteries, sexual sins, thefts, false testimony, and blasphemies.
Noun: Genitive Singular Feminine

Mark 3:5 καὶ περιβλεψάμενος αὐτοὺς μετ' ὀργῆς, συλλυπούμενος ἐπὶ τῇ πωρώσει τῆς καρδίας αὐτῶν λέγει τῷ ἀνθρώπῳ· ἔκτεινον τὴν χεῖρα (σου). καὶ ἐξέτεινεν καὶ ἀπεκατεστάθη ἡ χεὶρ αὐτοῦ.
When he had looked around at them with anger, being grieved at the hardening of their hearts, he said to the man, "Stretch out your hand." He stretched it out, and his hand was restored as healthy as the other.
Noun: Genitive Singular Feminine

Mark 7:21 ἔσωθεν γὰρ ἐκ τῆς καρδίας τῶν ἀνθρώπων οἱ διαλογισμοὶ οἱ κακοὶ ἐκπορεύονται, πορνεῖαι, κλοπαί, φόνοι,
For from within, out of the hearts of men, proceed evil thoughts, adulteries, sexual sins, murders, thefts,
Noun: Genitive Singular Feminine

Mark 12:30 καὶ ἀγαπήσεις κύριον τὸν θεόν σου ἐξ ὅλης [τῆς] καρδίας σου καὶ ἐξ ὅλης τῆς ψυχῆς σου καὶ ἐξ ὅλης τῆς διανοίας σου καὶ ἐξ ὅλης τῆς ἰσχύος σου.
you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.' This is the first commandment.
Noun: Genitive Singular Feminine

Mark 12:33 καὶ τὸ ἀγαπᾶν αὐτὸν ἐξ ὅλης [τῆς] καρδίας καὶ ἐξ ὅλης τῆς συνέσεως καὶ ἐξ ὅλης τῆς ἰσχύος καὶ τὸ ἀγαπᾶν τὸν πλησίον ὡς ἑαυτὸν περισσότερόν ἐστιν πάντων τῶν ὁλοκαυτωμάτων καὶ θυσιῶν.
and to love him with all the heart, and with all the understanding, with all the soul, and with all the strength, and to love his neighbor as himself, is more important than all whole burnt offerings and sacrifices."
Noun: Genitive Singular Feminine

Luke 1:17 καὶ αὐτὸς προελεύσεται ἐνώπιον αὐτοῦ ἐν πνεύματι καὶ δυνάμει Ἠλίου, ἐπιστρέψαι καρδίας πατέρων ἐπὶ τέκνα καὶ ἀπειθεῖς ἐν φρονήσει δικαίων, ἑτοιμάσαι κυρίῳ λαὸν κατεσκευασμένον.
He will go before him in the spirit and power of Elijah, 'to turn the hearts of the fathers to the children,' and the disobedient to the wisdom of the just; to prepare a people prepared for the Lord."
Noun: Accusative Plural Feminine

Luke 1:51 ἐποίησεν κράτος ἐν βραχίονι αὐτοῦ, διεσκόρπισεν ὑπερηφάνους διανοίᾳ καρδίας αὐτῶν·
He has shown strength with his arm. He has scattered the proud in the imagination of their hearts.
Noun: Genitive Singular Feminine

Luke 6:45 ὁ ἀγαθὸς ἄνθρωπος ἐκ τοῦ ἀγαθοῦ θησαυροῦ τῆς καρδίας προφέρει τὸ ἀγαθόν, καὶ ὁ πονηρὸς ἐκ τοῦ πονηροῦ προφέρει τὸ πονηρόν· ἐκ γὰρ περισσεύματος καρδίας λαλεῖ τὸ στόμα αὐτοῦ.
The good man out of the good treasure of his heart brings out that which is good, and the evil man out of the evil treasure of his heart brings out that which is evil, for out of the abundance of the heart, his mouth speaks.
Noun: Genitive Singular Feminine

Luke 6:45 ὁ ἀγαθὸς ἄνθρωπος ἐκ τοῦ ἀγαθοῦ θησαυροῦ τῆς καρδίας προφέρει τὸ ἀγαθόν, καὶ ὁ πονηρὸς ἐκ τοῦ πονηροῦ προφέρει τὸ πονηρόν· ἐκ γὰρ περισσεύματος καρδίας λαλεῖ τὸ στόμα αὐτοῦ.
The good man out of the good treasure of his heart brings out that which is good, and the evil man out of the evil treasure of his heart brings out that which is evil, for out of the abundance of the heart, his mouth speaks.
Noun: Genitive Singular Feminine

Luke 8:12 οἱ δὲ παρὰ τὴν ὁδόν εἰσιν οἱ ἀκούσαντες εἶτα ἔρχεται ὁ διάβολος καὶ αἴρει τὸν λόγον ἀπὸ τῆς καρδίας αὐτῶν ἵνα μὴ πιστεύσαντες σωθῶσιν.
Those along the road are those who hear, then the devil comes, and takes away the word from their heart, that they may not believe and be saved.
Noun: Genitive Singular Feminine

Luke 9:47 ὁ δὲ Ἰησοῦς εἰδὼς τὸν διαλογισμὸν τῆς καρδίας αὐτῶν, ἐπιλαβόμενος παιδίον ἔστησεν αὐτὸ παρ' ἑαυτῷ
Jesus, perceiving the reasoning of their hearts, took a little child, and set him by his side,
Noun: Genitive Singular Feminine

Luke 10:27 ὁ δὲ ἀποκριθεὶς εἶπεν· ἀγαπήσεις κύριον τὸν θεόν σου ἐξ ὅλης [τῆς] καρδίας σου καὶ ἐν ὅλῃ τῇ ψυχῇ σου καὶ ἐν ὅλῃ τῇ ἰσχύϊ σου καὶ ἐν ὅλῃ τῇ διανοίᾳ σου καὶ τὸν πλησίον σου ὡς σεαυτόν.
He answered, "You shall love the Lord your God with all your heart, with all your soul, with all your strength, and with all your mind; and your neighbor as yourself."
Noun: Genitive Singular Feminine

Luke 16:15 καὶ εἶπεν αὐτοῖς· ὑμεῖς ἐστε οἱ δικαιοῦντες ἑαυτοὺς ἐνώπιον τῶν ἀνθρώπων, ὁ δὲ θεὸς γινώσκει τὰς καρδίας ὑμῶν· ὅτι τὸ ἐν ἀνθρώποις ὑψηλὸν βδέλυγμα ἐνώπιον τοῦ θεοῦ.
He said to them, "You are those who justify yourselves in the sight of men, but God knows your hearts. For that which is exalted among men is an abomination in the sight of God.
Noun: Accusative Plural Feminine

Acts 2:46 καθ' ἡμέραν τε προσκαρτεροῦντες ὁμοθυμαδὸν ἐν τῷ ἱερῷ, κλῶντές τε κατ' οἶκον ἄρτον, μετελάμβανον τροφῆς ἐν ἀγαλλιάσει καὶ ἀφελότητι καρδίας
Day by day, continuing steadfastly with one accord in the temple, and breaking bread at home, they took their food with gladness and singleness of heart,
Noun: Genitive Singular Feminine

Acts 8:22 μετανόησον οὖν ἀπὸ τῆς κακίας σου ταύτης καὶ δεήθητι τοῦ κυρίου εἰ ἄρα ἀφεθήσεταί σοι ἡ ἐπίνοια τῆς καρδίας σου,
Repent therefore of this, your wickedness, and ask God if perhaps the thought of your heart may be forgiven you.
Noun: Genitive Singular Feminine

Acts 11:23 ὃς παραγενόμενος καὶ ἰδὼν τὴν χάριν τὴν τοῦ θεοῦ, ἐχάρη καὶ παρεκάλει πάντας τῇ προθέσει τῆς καρδίας προσμένειν (ἐν) τῷ κυρίῳ,
who, when he had come, and had seen the grace of God, was glad. He exhorted them all, that with purpose of heart they should remain near to the Lord.
Noun: Genitive Singular Feminine

Acts 14:17 καίτοι οὐκ ἀμάρτυρον αὐτὸν ἀφῆκεν ἀγαθουργῶν, οὐρανόθεν ὑμῖν ὑετοὺς διδοὺς καὶ καιροὺς καρποφόρους, ἐμπιπλῶν τροφῆς καὶ εὐφροσύνης τὰς καρδίας ὑμῶν.
Yet he didn't leave himself without witness, in that he did good and gave you rains from the sky and fruitful seasons, filling our hearts with food and gladness."
Noun: Accusative Plural Feminine

Acts 15:9 καὶ οὐθὲν διέκρινεν μεταξὺ ἡμῶν τε καὶ αὐτῶν τῇ πίστει καθαρίσας τὰς καρδίας αὐτῶν.
He made no distinction between us and them, cleansing their hearts by faith.
Noun: Accusative Plural Feminine

Romans 2:29 ἀλλ' ὁ ἐν τῷ κρυπτῷ Ἰουδαῖος, καὶ περιτομὴ καρδίας ἐν πνεύματι οὐ γράμματι, οὗ ὁ ἔπαινος οὐκ ἐξ ἀνθρώπων ἀλλ' ἐκ τοῦ θεοῦ.
but he is a Jew who is one inwardly, and circumcision is that of the heart, in the spirit not in the letter; whose praise is not from men, but from God.
Noun: Genitive Singular Feminine

Romans 6:17 χάρις δὲ τῷ θεῷ ὅτι ἦτε δοῦλοι τῆς ἁμαρτίας ὑπηκούσατε δὲ ἐκ καρδίας εἰς ὃν παρεδόθητε τύπον διδαχῆς,
But thanks be to God, that, whereas you were bondservants of sin, you became obedient from the heart to that form of teaching whereunto you were delivered.
Noun: Genitive Singular Feminine

Romans 8:27 ὁ δὲ ἐραυνῶν τὰς καρδίας οἶδεν τί τὸ φρόνημα τοῦ πνεύματος ὅτι κατὰ θεὸν ἐντυγχάνει ὑπὲρ ἁγίων.
He who searches the hearts knows what is on the Spirit's mind, because he makes intercession for the saints according to God.
Noun: Accusative Plural Feminine

Romans 10:1 ἀδελφοί, ἡ μὲν εὐδοκία τῆς ἐμῆς καρδίας καὶ ἡ δέησις πρὸς τὸν θεὸν ὑπὲρ αὐτῶν εἰς σωτηρίαν.
Brothers, my heart's desire and my prayer to God is for Israel, that they may be saved.
Noun: Genitive Singular Feminine

Romans 16:18 οἱ γὰρ τοιοῦτοι τῷ κυρίῳ ἡμῶν Χριστῷ οὐ δουλεύουσιν ἀλλὰ τῇ ἑαυτῶν κοιλίᾳ, καὶ διὰ τῆς χρηστολογίας καὶ εὐλογίας ἐξαπατῶσιν τὰς καρδίας τῶν ἀκάκων.
For those who are such don't serve our Lord, Jesus Christ, but their own belly; and by their smooth and flattering speech, they deceive the hearts of the innocent.
Noun: Accusative Plural Feminine

1 Corinthians 14:25 τὰ κρυπτὰ τῆς καρδίας αὐτοῦ φανερὰ γίνεται, καὶ οὕτως πεσὼν ἐπὶ πρόσωπον προσκυνήσει τῷ θεῷ ἀπαγγέλλων ὅτι ὄντως ὁ θεὸς ἐν ὑμῖν ἐστιν.
And thus the secrets of his heart are revealed. So he will fall down on his face and worship God, declaring that God is among you indeed.
Noun: Genitive Singular Feminine

2 Corinthians 2:4 ἐκ γὰρ πολλῆς θλίψεως καὶ συνοχῆς καρδίας ἔγραψα ὑμῖν διὰ πολλῶν δακρύων, οὐχ ἵνα λυπηθῆτε ἀλλὰ τὴν ἀγάπην ἵνα γνῶτε ἣν ἔχω περισσοτέρως εἰς ὑμᾶς.
For out of much affliction and anguish of heart I wrote to you with many tears, not that you should be made sorry, but that you might know the love that I have so abundantly for you.
Noun: Genitive Singular Feminine

Galatians 4:6 ὅτι δέ ἐστε υἱοί ἐξαπέστειλεν ὁ θεὸς τὸ πνεῦμα τοῦ υἱοῦ αὐτοῦ εἰς τὰς καρδίας ἡμῶν κρᾶζον· αββα ὁ πατήρ.
And because you are children, God sent out the Spirit of his Son into your hearts, crying, "Abba, Father!"
Noun: Accusative Plural Feminine

Ephesians 1:18 πεφωτισμένους τοὺς ὀφθαλμοὺς τῆς καρδίας ὑμῶν εἰς τὸ εἰδέναι ὑμᾶς τίς ἐστιν ἡ ἐλπὶς τῆς κλήσεως αὐτοῦ, τίς ὁ πλοῦτος τῆς δόξης τῆς κληρονομίας αὐτοῦ ἐν τοῖς ἁγίοις,
having the eyes of your hearts enlightened, that you may know what is the hope of his calling, and what are the riches of the glory of his inheritance in the saints,
Noun: Genitive Singular Feminine

Ephesians 4:18 ἐσκοτωμένοι τῇ διανοίᾳ ὄντες, ἀπηλλοτριωμένοι τῆς ζωῆς τοῦ θεοῦ διὰ τὴν ἄγνοιαν τὴν οὖσαν ἐν αὐτοῖς, διὰ τὴν πώρωσιν τῆς καρδίας αὐτῶν.
being darkened in their understanding, alienated from the life of God, because of the ignorance that is in them, because of the hardening of their hearts;
Noun: Genitive Singular Feminine

Ephesians 6:5 Οἱ δοῦλοι, ὑπακούετε τοῖς κατὰ σάρκα κυρίοις μετὰ φόβου καὶ τρόμου ἐν ἁπλότητι τῆς καρδίας ὑμῶν ὡς τῷ Χριστῷ,
Servants, be obedient to those who according to the flesh are your masters, with fear and trembling, in singleness of your heart, as to Christ;
Noun: Genitive Singular Feminine

Ephesians 6:22 ὃν ἔπεμψα πρὸς ὑμᾶς εἰς αὐτὸ τοῦτο, ἵνα γνῶτε τὰ περὶ ἡμῶν καὶ παρακαλέσῃ τὰς καρδίας ὑμῶν.
whom I have sent to you for this very purpose, that you may know our state, and that he may comfort your hearts.
Noun: Accusative Plural Feminine

Philippians 4:7 καὶ ἡ εἰρήνη τοῦ θεοῦ ἡ ὑπερέχουσα πάντα νοῦν φρουρήσει τὰς καρδίας ὑμῶν καὶ τὰ νοήματα ὑμῶν ἐν Χριστῷ Ἰησοῦ.
And the peace of God, which surpasses all understanding, will guard your hearts and your thoughts in Christ Jesus.
Noun: Accusative Plural Feminine

Colossians 3:22 Οἱ δοῦλοι, ὑπακούετε κατὰ πάντα τοῖς κατὰ σάρκα κυρίοις, μὴ ἐν ὀφθαλμοδουλίαις / ὀφθαλμοδουλίᾳ ὡς ἀνθρωπάρεσκοι, ἀλλ' ἐν ἁπλότητι καρδίας φοβούμενοι τὸν κύριον.
Servants, obey in all things those who are your masters according to the flesh, not just when they are looking, as men pleasers, but in singleness of heart, fearing God.
Noun: Genitive Singular Feminine

Colossians 4:8 ὃν ἔπεμψα πρὸς ὑμᾶς εἰς αὐτὸ τοῦτο, ἵνα γνῶτε τὰ περὶ ἡμῶν καὶ παρακαλέσῃ τὰς καρδίας ὑμῶν,
I am sending him to you for this very purpose, that he may know your circumstances and comfort your hearts,
Noun: Accusative Plural Feminine

1 Thessalonians 2:4 ἀλλὰ καθὼς δεδοκιμάσμεθα ὑπὸ τοῦ θεοῦ πιστευθῆναι τὸ εὐαγγέλιον, οὕτως λαλοῦμεν, οὐχ ὡς ἀνθρώποις ἀρέσκοντες ἀλλὰ θεῷ τῷ δοκιμάζοντι τὰς καρδίας ἡμῶν.
But even as we have been approved by God to be entrusted with the Good News, so we speak; not as pleasing men, but God, who tests our hearts.
Noun: Accusative Plural Feminine

1 Thessalonians 3:13 εἰς τὸ στηρίξαι ὑμῶν τὰς καρδίας ἀμέμπτους ἐν ἁγιωσύνῃ ἔμπροσθεν τοῦ θεοῦ καὶ πατρὸς ἡμῶν ἐν τῇ παρουσίᾳ τοῦ κυρίου ἡμῶν Ἰησοῦ μετὰ πάντων τῶν ἁγίων αὐτοῦ [ἀμήν].
to the end he may establish your hearts blameless in holiness before our God and Father, at the coming of our Lord Jesus with all his saints.
Noun: Accusative Plural Feminine

2 Thessalonians 2:17 παρακαλέσαι ὑμῶν τὰς καρδίας καὶ στηρίξαι ἐν παντὶ ἔργῳ καὶ λόγῳ ἀγαθῷ.
comfort your hearts and establish you in every good work and word.
Noun: Accusative Plural Feminine

2 Thessalonians 3:5 ὁ δὲ κύριος κατευθύναι ὑμῶν τὰς καρδίας εἰς τὴν ἀγάπην τοῦ θεοῦ καὶ εἰς τὴν ὑπομονὴν τοῦ Χριστοῦ.
May the Lord direct your hearts into the love of God, and into the patience of Christ.
Noun: Accusative Plural Feminine

1 Timothy 1:5 τὸ δὲ τέλος τῆς παραγγελίας ἐστὶν ἀγάπη ἐκ καθαρᾶς καρδίας καὶ συνειδήσεως ἀγαθῆς καὶ πίστεως ἀνυποκρίτου,
but the goal of this command is love, out of a pure heart and a good conscience and sincere faith;
Noun: Genitive Singular Feminine

2 Timothy 2:22 τὰς δὲ νεωτερικὰς ἐπιθυμίας φεῦγε, δίωκε δὲ δικαιοσύνην πίστιν ἀγάπην εἰρήνην μετὰ τῶν ἐπικαλουμένων τὸν κύριον ἐκ καθαρᾶς καρδίας.
Flee from youthful lusts; but pursue righteousness, faith, love, and peace with those who call on the Lord out of a pure heart.
Noun: Genitive Singular Feminine

Hebrews 3:8 μὴ σκληρύνητε τὰς καρδίας ὑμῶν ὡς ἐν τῷ παραπικρασμῷ κατὰ τὴν ἡμέραν τοῦ πειρασμοῦ ἐν τῇ ἐρήμῳ,
don't harden your hearts, as in the rebellion, like as in the day of the trial in the wilderness,
Noun: Accusative Plural Feminine

Hebrews 3:15 ἐν τῷ λέγεσθαι, σήμερον ἐὰν τῆς φωνῆς αὐτοῦ ἀκούσητε, μὴ σκληρύνητε τὰς καρδίας ὑμῶν ὡς ἐν τῷ παραπικρασμῷ.
while it is said, "Today if you will hear his voice, don't harden your hearts, as in the rebellion."
Noun: Accusative Plural Feminine

Hebrews 4:7 πάλιν τινὰ ὁρίζει ἡμέραν, σήμερον, ἐν Δαυὶδ λέγων μετὰ τοσοῦτον χρόνον, καθὼς προείρηται, σήμερον ἐὰν τῆς φωνῆς αὐτοῦ ἀκούσητε μὴ σκληρύνητε τὰς καρδίας ὑμῶν.
he again defines a certain day, today, saying through David so long a time afterward (just as has been said), "Today if you will hear his voice, don't harden your hearts."
Noun: Accusative Plural Feminine

Hebrews 4:12 Ζῶν γὰρ ὁ λόγος τοῦ θεοῦ καὶ ἐνεργὴς καὶ τομώτερος ὑπὲρ πᾶσαν μάχαιραν δίστομον καὶ διϊκνούμενος ἄχρι μερισμοῦ ψυχῆς καὶ πνεύματος, ἁρμῶν τε καὶ μυελῶν, καὶ κριτικὸς ἐνθυμήσεων καὶ ἐννοιῶν καρδίας·
For the word of God is living, and active, and sharper than any two-edged sword, and piercing even to the dividing of soul and spirit, of both joints and marrow, and is able to discern the thoughts and intentions of the heart.
Noun: Genitive Singular Feminine

Hebrews 8:10 ὅτι αὕτη ἡ διαθήκη ἣν διαθήσομαι τῷ οἴκῳ Ἰσραὴλ μετὰ τὰς ἡμέρας ἐκείνας, λέγει κύριος· διδοὺς νόμους μου εἰς τὴν διάνοιαν αὐτῶν καὶ ἐπὶ καρδίας αὐτῶν ἐπιγράψω αὐτούς, καὶ ἔσομαι αὐτοῖς εἰς θεὸν, καὶ αὐτοὶ ἔσονταί μοι εἰς λαόν·
"For this is the covenant that I will make with the house of Israel. After those days," says the Lord; "I will put my laws into their mind, I will also write them on their heart. I will be their God, and they will be my people.
Noun: Accusative Plural Feminine

Hebrews 10:16 αὕτη ἡ διαθήκη ἣν διαθήσομαι πρὸς αὐτοὺς, μετὰ τὰς ἡμέρας ἐκείνας, λέγει κύριος· διδοὺς νόμους μου ἐπὶ καρδίας αὐτῶν καὶ ἐπὶ τὴν διάνοιαν αὐτῶν ἐπιγράψω αὐτούς,
"This is the covenant that I will make with them: 'After those days,' says the Lord, 'I will put my laws on their heart, I will also write them on their mind;'" then he says,
Noun: Accusative Plural Feminine

Hebrews 10:22 προσερχώμεθα μετὰ ἀληθινῆς καρδίας ἐν πληροφορίᾳ πίστεως ῥεραντισμένοι τὰς καρδίας ἀπὸ συνειδήσεως πονηρᾶς καὶ λελουσμένοι τὸ σῶμα ὕδατι καθαρῷ·
let's draw near with a true heart in fullness of faith, having our hearts sprinkled from an evil conscience, and having our body washed with pure water,
Noun: Genitive Singular Feminine

Hebrews 10:22 προσερχώμεθα μετὰ ἀληθινῆς καρδίας ἐν πληροφορίᾳ πίστεως ῥεραντισμένοι τὰς καρδίας ἀπὸ συνειδήσεως πονηρᾶς καὶ λελουσμένοι τὸ σῶμα ὕδατι καθαρῷ·
let's draw near with a true heart in fullness of faith, having our hearts sprinkled from an evil conscience, and having our body washed with pure water,
Noun: Accusative Plural Feminine

James 4:8 ἐγγίσατε τῷ θεῷ καὶ ἐγγίσει / ἐγγιεῖ ὑμῖν καθαρίσατε χεῖρας, ἁμαρτωλοί, καὶ ἁγνίσατε καρδίας, δίψυχοι.
Draw near to God, and he will draw near to you. Cleanse your hands, you sinners; and purify your hearts, you double-minded.
Noun: Accusative Plural Feminine

James 5:5 ἐτρυφήσατε ἐπὶ τῆς γῆς καὶ ἐσπαταλήσατε, ἐθρέψατε τὰς καρδίας ὑμῶν ἐν ἡμέρᾳ σφαγῆς,
You have lived delicately on the earth, and taken your pleasure. You have nourished your hearts as in a day of slaughter.
Noun: Accusative Plural Feminine

James 5:8 μακροθυμήσατε καὶ ὑμεῖς, στηρίξατε τὰς καρδίας ὑμῶν, ὅτι ἡ παρουσία τοῦ κυρίου ἤγγικεν.
You also be patient. Establish your hearts, for the coming of the Lord is at hand.
Noun: Accusative Plural Feminine

1 Peter 1:22 Τὰς ψυχὰς ὑμῶν ἡγνικότες ἐν τῇ ὑπακοῇ τῆς ἀληθείας εἰς φιλαδελφίαν ἀνυπόκριτον, ἐκ [καθαρᾶς] καρδίας ἀλλήλους ἀγαπήσατε ἐκτενῶς
Seeing you have purified your souls in your obedience to the truth through the Spirit in sincere brotherly affection, love one another from the heart fervently:
Noun: Genitive Singular Feminine

1 Peter 3:4 ἀλλ' ὁ κρυπτὸς τῆς καρδίας ἄνθρωπος ἐν τῷ ἀφθάρτῳ τοῦ ἡσυχίου / πραέως καὶ πραέως / ἡσυχίου πνεύματος, ὅ ἐστιν ἐνώπιον τοῦ θεοῦ πολυτελές.
but in the hidden person of the heart, in the incorruptible adornment of a gentle and quiet spirit, which is in the sight of God very precious.
Noun: Genitive Singular Feminine

1 John 3:20 ὅτι ἐὰν καταγινώσκῃ ἡμῶν ἡ καρδία, ὅτι μείζων ἐστὶν ὁ θεὸς τῆς καρδίας ἡμῶν καὶ γινώσκει πάντα.
because if our heart condemns us, God is greater than our heart, and knows all things.
Noun: Genitive Singular Feminine

Revelation 2:23 καὶ τὰ τέκνα αὐτῆς ἀποκτενῶ ἐν θανάτῳ. καὶ γνώσονται πᾶσαι αἱ ἐκκλησίαι ὅτι ἐγώ εἰμι ὁ ἐραυνῶν νεφροὺς καὶ καρδίας καὶ δώσω ὑμῖν ἑκάστῳ κατὰ τὰ ἔργα ὑμῶν.
I will kill her children with Death, and all the assemblies will know that I am he who searches the minds and hearts. I will give to each one of you according to your deeds.
Noun: Accusative Plural Feminine

Revelation 17:17 ὁ γὰρ θεὸς ἔδωκεν εἰς τὰς καρδίας αὐτῶν ποιῆσαι τὴν γνώμην αὐτοῦ καὶ ποιῆσαι μίαν γνώμην καὶ δοῦναι τὴν βασιλείαν αὐτῶν τῷ θηρίῳ ἄχρι τελεσθήσονται οἱ λόγοι τοῦ θεοῦ.
For God has put in their hearts to do what he has in mind, and to be of one mind, and to give their kingdom to the beast, until the words of God should be accomplished.
Noun: Accusative Plural Feminine