Contradiction with Acts 22:3-4
These verses confirm Paul's persecution of the church rather than contradict it, but might be seen as contradictory if looking solely for a shift in behavior without context.
Acts 22:3-4: I am verily a man [which am] a Jew, born in Tarsus, [a city] in Cilicia, yet brought up in this city at the feet of Gamaliel, [and] taught according to the perfect manner of the law of the fathers, and was zealous toward God, as ye all are this day.
Contradiction with 1 Timothy 1:13
Instead of contradiction, it aligns with the confession of persecuting the church, illustrating forgiveness rather than contradiction.
1 Timothy 1:13: Who was before a blasphemer, and a persecutor, and injurious: but I obtained mercy, because I did [it] ignorantly in unbelief.
Contradiction with Acts 9:1-2
Like in Galatians 1:13, these verses recount Saul's persecution of Christians, so they do not directly contradict but can be seen in contradiction when considering his later conversion and teachings.
Acts 9:1-2: And Saul, yet breathing out threatenings and slaughter against the disciples of the Lord, went unto the high priest,