Mark 1:1 ἀρχὴ τοῦ εὐαγγελίου Ἰησοῦ Χριστοῦ [υἱοῦ θεοῦ].
The beginning of the Good News of Jesus Christ, the Son of God.
Noun: Nominative Singular Feminine

Mark 13:8 ἐγερθήσεται γὰρ ἔθνος ἐπ' ἔθνος καὶ βασιλεία ἐπὶ βασιλείαν, ἔσονται σεισμοὶ κατὰ τόπους, ἔσονται λιμοί· ἀρχὴ ὠδίνων ταῦτα.
For nation will rise against nation, and kingdom against kingdom. There will be earthquakes in various places. There will be famines and troubles. These things are the beginning of birth pains.
Noun: Nominative Singular Feminine

Luke 20:20 Καὶ παρατηρήσαντες ἀπέστειλαν ἐγκαθέτους ὑποκρινομένους ἑαυτοὺς δικαίους εἶναι, ἵνα ἐπιλάβωνται αὐτοῦ λόγου, ὥστε παραδοῦναι αὐτὸν τῇ ἀρχῇ καὶ τῇ ἐξουσίᾳ τοῦ ἡγεμόνος.
They watched him, and sent out spies, who pretended to be righteous, that they might trap him in something he said, so as to deliver him up to the power and authority of the governor.
Noun: Dative Singular Feminine

John 1:1 ἐν ἀρχῇ ἦν ὁ λόγος, καὶ ὁ λόγος ἦν πρὸς τὸν θεόν, καὶ θεὸς ἦν ὁ λόγος.
In the beginning was the Word, and the Word was with God, and the Word was God.
Noun: Dative Singular Feminine

John 1:2 οὗτος ἦν ἐν ἀρχῇ πρὸς τὸν θεόν.
The same was in the beginning with God.
Noun: Dative Singular Feminine

Acts 11:15 ἐν δὲ τῷ ἄρξασθαί με λαλεῖν ἐπέπεσεν τὸ πνεῦμα τὸ ἅγιον ἐπ' αὐτοὺς ὥσπερ καὶ ἐφ' ἡμᾶς ἐν ἀρχῇ.
As I began to speak, the Holy Spirit fell on them, even as on us at the beginning.
Noun: Dative Singular Feminine

Philippians 4:15 Οἴδατε δὲ καὶ ὑμεῖς Φιλιππήσιοι ὅτι ἐν ἀρχῇ τοῦ εὐαγγελίου, ὅτε ἐξῆλθον ἀπὸ Μακεδονίας, οὐδεμία μοι ἐκκλησία ἐκοινώνησεν εἰς λόγον δόσεως καὶ λήμψεως εἰ μὴ ὑμεῖς μόνοι,
You yourselves also know, you Philippians, that in the beginning of the Good News, when I departed from Macedonia, no assembly shared with me in the matter of giving and receiving but you only.
Noun: Dative Singular Feminine

Colossians 1:18 καὶ αὐτός ἐστιν ἡ κεφαλὴ τοῦ σώματος τῆς ἐκκλησίας· ὅς ἐστιν (ἡ) ἀρχή, πρωτότοκος ἐκ τῶν νεκρῶν, ἵνα γένηται ἐν πᾶσιν αὐτὸς πρωτεύων,
He is the head of the body, the assembly, who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.
Noun: Nominative Singular Feminine

Revelation 3:14 Καὶ τῷ ἀγγέλῳ τῆς ἐν Λαοδικείᾳ ἐκκλησίας γράψον· Τάδε λέγει ὁ ἀμήν, ὁ μάρτυς ὁ πιστὸς καὶ (ὁ) ἀληθινός, ἡ ἀρχὴ τῆς κτίσεως τοῦ θεοῦ
"To the angel of the assembly in Laodicea write: "The Amen, the Faithful and True Witness, the Head of God's creation, says these things:
Noun: Nominative Singular Feminine

Revelation 21:6 καὶ εἶπέν μοι, γέγοναν. ἐγώ [εἰμι] τὸ Ἄλφα καὶ τὸ Ὦ, ἡ ἀρχὴ καὶ τὸ τέλος. ἐγὼ τῷ διψῶντι δώσω ἐκ τῆς πηγῆς τοῦ ὕδατος τῆς ζωῆς δωρεάν.
He said to me, "It is done! I am the Alpha and the Omega, the Beginning and the End. I will give freely to him who is thirsty from the spring of the water of life.
Noun: Nominative Singular Feminine

Revelation 22:13 ἐγὼ τὸ Ἄλφα καὶ τὸ Ὦ, ὁ πρῶτος καὶ ὁ ἔσχατος, ἡ ἀρχὴ καὶ τὸ τέλος.
I am the Alpha and the Omega, the First and the Last, the Beginning and the End.
Noun: Nominative Singular Feminine