Ephesians 3:3, 5
Ephesians 3:3 AMP
and that by [divine] revelation the mystery was made known to me, as I have already written in brief. [Eph 1:9]
Ephesians 3:5 AMP
which in other generations was not disclosed to mankind, as it has now been revealed to His holy apostles and prophets by the [Holy] Spirit