Who were Jannes and Jambres? 2 Timothy 3v8
&quot;Just as Jannes and Jambres opposed Moses, so also these teachers oppose the truth. They are men of depraved minds, who, as far as the faith is concerned, are rejected.&quot;

Who were they?
They seem to be of the magicians that worked against Moses in Egypt:


  They also appear in Pliny the Elder's Natural History, together with Moses, as famous magicians of antiquity; Pliny's citation is also referred to in Apuleius. Numerius, a Pythagorean philosopher, calls them sacred Egyptian scribes.


This has been taken from Wikipedia, and I don't know how much weight should be given it. However, they seems to be evidence backing it up:


  The Apocryphon of Jannes and Jambres the magicians is a manuscript among the Chester Beatty Papyri No XVI, which has been edited and translated by Albert Pietersma.


The Jews have long since known of them. Taken from a Jewish Encyclopedia:


  Names of two legendary wizards of Pharaoh "who withstood Moses" (II Tim. iii. 8) by imitating "with their enchantments" the works of Moses and Aaron, though they were defeated (Ex. vii. 11, viii. 7). According to rabbinical tradition they were the two chiefs of the magicians at the court of Pharaoh who foretold the birth of Moses, "the destroyer of the land of Egypt," thereby causing the cruel edicts of Pharaoh (Soṭah 11a; Sanh. 106a). They said to Moses when he performed his miracles with the water and the rod: "Dost thou wish to introduce magic into Egypt, the native land of the magic art?" (Men. 85a)