Mark 9:2-10

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. Then Peter answered and said to Jesus, “Rabbi, it is good for us to be here; and let us make three tabernacles: one for You, one for Moses, and one for Elijah”— because he did not know what to say, for they were greatly afraid. And a cloud came and overshadowed them; and a voice came out of the cloud, saying, “This is My beloved Son. Hear Him!” Suddenly, when they had looked around, they saw no one anymore, but only Jesus with themselves. Now as they came down from the mountain, He commanded them that they should tell no one the things they had seen, till the Son of Man had risen from the dead. So they kept this word to themselves, questioning what the rising from the dead meant.