Albert Barnes Commentary Acts 9:16

"for I will show him how many things he must suffer for my name`s sake." — Acts 9:16 (ASV)

For I will shew him, etc. This seems to be added to encourage Ananias. He had feared Saul. The Lord now informs him that Saul, until now his enemy, would ever after be his friend. He would not merely profess repentance, but would manifest the sincerity of it by encountering trials and reproaches for His sake. The prediction here was fully accomplished, Acts 20:23; 2 Corinthians 11:23–27; 2 Timothy 1:11–12.