Mark 9:2

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

Augustine of Hippo

AD 430
Leaving out of their calculation the day on which Jesus spoke these words, and the day on which he exhibited that memorable spectacle on the mount, they have regarded simply the intermediate days, and have used the expression, “after six days.” But Luke, reckoning in the extreme day at either end, that is to say, the first day and the last day, has made it “after eight days,” in accordance with that mode of speech in which the part is put for the whole.
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Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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