Simon Magus was convinced that he was indeed such as the apostles had spoken him to be; and knowing them to be powerful with God, he desires this of them. He feigns himself to be a true penitent, being terrified with the threatening of St. Peter, Acts 8:20, and probably fearing the punishment of Ananias and Sapphira might befall him, which it is likely he had heard of.
Related Commentaries of Acts 8:24
Acts 8:24
24 Then answered Simon, and said, Pray ye to the Lord for me, that none of these things which ye have spoken come upon me.