Joseph Benson's Commentary of the Old and New Testaments - 2 Timothy 3:8-9
2 Timothy 3:8-9. Now as Jannes and Jambres Some ancient writers speak of these persons as the chief of Pharaoh’s magicians, whose names, though not recorded by Moses, yet being handed down by tradition, are preserved in Jonathan’s Chaldee Paraphrase on Exodus 7:11; withstood Moses We learn from Exodus 7:11; Exodus 7:22, that Pharaoh’s magicians imitated three of Moses’s miracles by their enchantments; that is, by repeating a form of words known only to themselves, in which they invoked... read more
Albert Barnes' Notes on the Whole Bible - 2 Timothy 3:8
Now as Jannes and Jambres withstood Moses - The names of these two men are not elsewhere mentioned in the Bible. They are supposed to have been two of the magicians who resisted Moses (Exodus 7:11, et al.), and who opposed their miracles to those of Moses and Aaron. It is not certain where the apostle obtained their names; but they are frequently mentioned by the Hebrew writers, and also by other writers; so that there can be no reasonable doubt that their names were correctly handed down by... read more