Throughout the Bible, there are many times where the people whom God chooses for particular tasks respond with objections (see Exodus 3:11, Exodus 3:13; Exodus 4:1, Exodus 4:10. Exodus 4:13; Isaiah 6:5; Jeremiah 1:6; Luke 1:18). In the case of Ananias, it is understandable that he fears Saul and what Saul can do to him. He knows that Saul has done great harm in Jerusalem and that he has authority to do the same in Damascus.1
13 But Ananias answered, “Lord, I have heard from many about this man, how much evil he has done to your saints at Jerusalem.