The Reader for the proper apprehension of this and the following verse, would do well to consider that God sometimes in his providence permits events, which are not within the power or the province of the human mind to account for: whether the magicians did actually do what is here said, or whether they possessed the art to make the spectators think so, is not easy to determine. I think it is more than probable, that the Lord over-ruled those circumstances in order that his sovereignty might, by and by, the more fully appear. See very strikingly to this effect, Exodus 8:19.
Related Commentaries of Exodus 7:10
Exodus 7:10-11
10 And Moses and Aaron went in unto Pharaoh, and they did so as the LORD had commanded: and Aaron cast down his rod before Pharaoh, and before his servants, and it became a serpent.
11 Then Pharaoh also called the wise men and the sorcerers: now the magicians of Egypt, they also did in like manner with their enchantments.