Ephesians 3:9 καὶ φωτίσαι [πάντας] τίς ἡ οἰκονομία τοῦ μυστηρίου τοῦ ἀποκεκρυμμένου ἀπὸ τῶν αἰώνων ἐν τῷ θεῷ τῷ τὰ πάντα κτίσαντι,
and to make all men see what is the administration of the mystery which for ages has been hidden in God, who created all things through Jesus Christ;
Noun: Genitive Singular Neuter

Colossians 1:27 οἷς ἠθέλησεν ὁ θεὸς γνωρίσαι τί τὸ πλοῦτος τῆς δόξης τοῦ μυστηρίου τούτου ἐν τοῖς ἔθνεσιν, ὅ ἐστιν Χριστὸς ἐν ὑμῖν ἡ ἐλπὶς τῆς δόξης·
to whom God was pleased to make known what are the riches of the glory of this mystery among the Gentiles, which is Christ in you, the hope of glory;
Noun: Genitive Singular Neuter

Colossians 2:2 ἵνα παρακληθῶσιν αἱ καρδίαι αὐτῶν συμβιβασθέντες ἐν ἀγάπῃ καὶ εἰς πᾶν πλοῦτος τῆς πληροφορίας τῆς συνέσεως εἰς ἐπίγνωσιν τοῦ μυστηρίου τοῦ θεοῦ, Χριστοῦ,
that their hearts may be comforted, they being knit together in love, and gaining all riches of the full assurance of understanding, that they may know the mystery of God, both of the Father and of Christ,
Noun: Genitive Singular Neuter