And after six days Jesus took with him Peter, and James, and John, and led them up into a high mountain apart by themselves: and he was transfigured before them.
All Commentaries on Mark 9:2 Go To Mark 9
Irenaeus of Lyons
AD 202
He asserts that the fruit of this arrangement and analogy has been manifested in the likeness of an image, namely, Him who, after six days, ascended