Acts 23:28-29

“And desiring to know the cause for which they accused him, I brought him down to their council, whom I found to be accused about questions of their law, but to have nothing laid to his charge worthy of death or of bonds.”

He explains how he was at pains to examine him, even bringing him before their Sanhedrin, but as a result discovered that it simply concerned questions of interpretation of Jewish teaching and that Paul had not been accused of anything which deserved death or bonds. Once again the Paul's innocence is emphasised.