Matthew 17:1
And after six days Jesus takes Peter, James, and John his brother, and brings them up into an high mountain apart,
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Mark 9:2
And after six days Jesus takes with him Peter, and James, and John, and leads them up into an high mountain apart by themselves: and he was transfigured before them.
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Luke 9:28
And it came to pass about an eight days after these sayings, he took Peter and John and James, and went up into a mountain to pray.
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