Why were the Christians in Jerusalem scared of Saul?
Acts 9:26 (ESV)
26And when he had come to Jerusalem, he attempted to join the disciples. And they were all afraid of him, for they did not believe that he was a disciple.
Christian believers in Jerusalem would very naturally be scared of Saul since he is the one who orchestrated the arrest of their friends and family (see Acts 8:1–4).
26 And when he had come to Jerusalem, he attempted to join the disciples. And they were all afraid of him, for they did not believe that he was a disciple.