Acts 26:26

“For the king knows of these things, to whom also I speak freely, for I am persuaded that none of these things is hidden from him, for this has not been done in a corner.”

Indeed, he asserts, King Agrippa knows of these things. He knows that the Scriptures clearly teach the resurrection of the body. And he knows of the claims that Jesus has risen from the dead, and of the evidences that have been put forward (as they have been again today). Thus he speaks freely. For none of these things were done in secret. They were well known by the Jews.