Whoever is coaching you guys that this is some sort of "gotcha" question really should spend some time studying your own Early Church Fathers, because it was answered long ago, by Jerome. His answer: Isaiah 11:1.
We can tell things to the Bible but I certainly don't see the word "Nazarene" in Isaiah 11:1 thus proving the Text does not suffice.
2Timothy 3:8, "Just as Jannes and Jambres resisted Moses, so these men also resist the truth..."
But are Jannes and Jambres in the Old Testament? Or do we have to find out elsewhere? Apparently we must consult Jewish Tradition to find out who they were.