A.T. Robertson Commentary Acts 26:27

"King Agrippa, believest thou the prophets? I know that thou believest." — Acts 26:27 (ASV)

I know that thou believest (οιδα οτ πιστευεις). Paul had "cornered" Agrippa by this direct challenge. As the Jew in charge of the temple he was bound to confess his faith in the prophets. But Paul had interpreted the prophets about the Messiah in a way that fell in with his claim that Jesus was the Messiah risen from the dead. To say, "Yes" would place himself in Paul's hands. To say "No" would mean that he did not believe the prophets. Agrippa had listened with the keenest interest, but he slipped out of the coils with adroitness and a touch of humour.