1 Corinthians 1:9 πιστὸς ὁ θεὸς, δι' οὗ ἐκλήθητε εἰς κοινωνίαν τοῦ υἱοῦ αὐτοῦ Ἰησοῦ Χριστοῦ τοῦ κυρίου ἡμῶν.
God is faithful, through whom you were called into the fellowship of his Son, Jesus Christ, our Lord.
Noun: Accusative Singular Feminine

2 Corinthians 8:4 μετὰ πολλῆς παρακλήσεως δεόμενοι ἡμῶν τὴν χάριν καὶ τὴν κοινωνίαν τῆς διακονίας τῆς εἰς τοὺς ἁγίους,
begging us with much entreaty to receive this grace and the fellowship in the service to the saints.
Noun: Accusative Singular Feminine

Philippians 3:10 τοῦ γνῶναι αὐτὸν καὶ τὴν δύναμιν τῆς ἀναστάσεως αὐτοῦ καὶ [τὴν] κοινωνίαν [τῶν] παθημάτων αὐτοῦ συμμορφιζόμενος τῷ θανάτῳ αὐτοῦ,
that I may know him, and the power of his resurrection, and the fellowship of his sufferings, becoming conformed to his death;
Noun: Accusative Singular Feminine

1 John 1:3 ὃ— ἑωράκαμεν καὶ ἀκηκόαμεν, ἀπαγγέλλομεν καὶ ὑμῖν, ἵνα καὶ ὑμεῖς κοινωνίαν ἔχητε μεθ' ἡμῶν. καὶ ἡ κοινωνία δὲ ἡ ἡμετέρα μετὰ τοῦ πατρὸς καὶ μετὰ τοῦ υἱοῦ αὐτοῦ Ἰησοῦ Χριστοῦ.
that which we have seen and heard we declare to you, that you also may have fellowship with us. Yes, and our fellowship is with the Father, and with his Son, Jesus Christ.
Noun: Accusative Singular Feminine

1 John 1:6 ἐὰν εἴπωμεν ὅτι κοινωνίαν ἔχομεν μετ' αὐτοῦ καὶ ἐν τῷ σκότει περιπατῶμεν, ψευδόμεθα καὶ οὐ ποιοῦμεν τὴν ἀλήθειαν·
If we say that we have fellowship with him and walk in the darkness, we lie, and don't tell the truth.
Noun: Accusative Singular Feminine

1 John 1:7 ἐὰν δὲ ἐν τῷ φωτὶ περιπατῶμεν, ὡς αὐτός ἐστιν ἐν τῷ φωτί, κοινωνίαν ἔχομεν μετ' ἀλλήλων καὶ τὸ αἷμα Ἰησοῦ τοῦ υἱοῦ αὐτοῦ καθαρίζει ἡμᾶς ἀπὸ πάσης ἁμαρτίας.
But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus Christ, his Son, cleanses us from all sin.
Noun: Accusative Singular Feminine