1 Timothy 2:6 Who gave himself a ransom for all, to be testified in due time.
Revealed to Paul, was the mystery, that the sacrificial death of Jesus was a ransom for all who would believe, both Jew and Gentile.
This mystery was not made known to the prophets of the old testament scriptures, neither to the twelve disciples. This mystery was hid in God and not made known to any before being revealed to Paul (
Ephesians 3:5 Ephesians 3:9).
Matthew 20:28 Even as the Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many.
Mark 10:45 For even the Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many.
What was made known in Matthew and Mark above, was that Christ gave his life to ransom many, not all. Christ gave his life to ransom Israel alone, the many. Christ redeemed the iniquities of Israel committed under the old testament (
Hebrews 9:15).
Only the mystery revealed the ransom was for all, and was only testified in due time, when revealed to Paul.