Yes, before his conversion he transgressed God's Commandments by his ancient religious traditions. He taught for Doctrines, the Commandments of Men, not God.
After his conversion he rejected these "Commandments of men" that the Pharisees, including himself, had tried to force on the people for centuries and followed God's Word.
Acts 26:
19 Whereupon, O king Agrippa,
I was not disobedient unto the heavenly vision:
20 But shewed first unto them of Damascus, and at Jerusalem, and throughout all the coasts of Judaea,
and then to the Gentiles, that they should
repent and
turn to God, and
do works meet for repentance.
21 For these causes
the Jews (Pharisees) caught me in the temple,
and went about to kill me.
22 Having therefore obtained help of God, I continue unto this day,
witnessing both to small and great,
saying none other things than those which the prophets and Moses did say should come:
23 That Christ should suffer,
and that he should be the first that should rise from the dead,
and should shew light unto the people,
and to the Gentiles.
Before his conversion he didn't teach this truth. He was a Pharisee and taught their religion, not the Word's of God.
I know this because Jesus said they taught for Doctrines "the Commandments of Men", not God. The Word's of God were strange to the Pharisees. Paul said they called them "Heresy".
14 But this I confess unto thee,
that after the way which they (Pharisees)
call heresy, so worship I the God of my fathers,
believing all things which are written in the law and in the prophets:
Before his conversion he was a Pharisee. He didn't believe "ALL THINGS" written in the Law and Prophets, they were "heresy" to him.
Some things are just truth. We either believe them or we don't. Our belief or unbelief doesn't change the truth.