Ephesians 3:5

which in other ages was not made known to the sons of men, as it has now been revealed by the Spirit to His holy apostles and prophets:

Surrounding context

3:4 by which, when you read, you may understand my knowledge in the mystery of Christ),

3:5 which in other ages was not made known to the sons of men, as it has now been revealed by the Spirit to His holy apostles and prophets:

3:6 that the Gentiles should be fellow heirs, of the same body, and partakers of His promise in Christ through the gospel,

Translation and sources