Mark 9:1-4

And He said to them, “Assuredly, I say to you that there are some standing here who will not taste death till they see the kingdom of God present with power.” Now after six days Jesus took Peter, James, and John, and led them up on a high mountain apart by themselves; and He was transfigured before them. His clothes became shining, exceedingly white, like snow, such as no launderer on earth can whiten them. And Elijah appeared to them with Moses, and they were talking with Jesus.