When he came to Jerusalem, he tried to join the disciples, but they were all afraid of him, not believing that he really was a disciple. (NIV)
And when he had arrived in Jerusalem, he tried to associate himself with the disciples; but they were all afraid of him, for they did not believe he really was a disciple. (AMP)
And when Saul was come to Jerusalem, he assayed to join himself to the disciples: but they were all afraid of him, and believed not that he was a disciple. (KJV)