Ephesians 3:2, 3, 5, 6

if, as I suppose, you have heard of the stewardship of God’s grace that was given to me for your benefit

[namely, that] the mystery was made known to me by revelation, as I have written briefly earlier.

which was not made known to human beings in other generations as it has now been revealed to his holy apostles and prophets by the Spirit

that the Gentiles are coheirs, members of the same body, and copartners in the promise in Christ Jesus through the gospel.