Acts 26:10

I gave my voice against [them]. "My vote" (Revised Version). This has been held to indicate that he was a member of the Sanhedrin. This would hardly be doubted were it not that tradition declares that the members of the Sanhedrin had to be married and fathers of a family. Hence, some have held that Paul was a member of some lesser court appointed by the Sanhedrin to try the Christians.
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