Mark 9:2-9

2 Six days later, Jesus took with him Peter and James and John, and led them up a high mountain apart, by themselves. And he was transfigured before them, 3 and his clothes became dazzling white, such as no one[a] on earth could bleach them. 4 And there appeared to them Elijah with Moses, who were talking with Jesus. 5 Then Peter said to Jesus, ‘Rabbi, it is good for us to be here; let us make three dwellings,[b] one for you, one for Moses, and one for Elijah.’ 6 He did not know what to say, for they were terrified. 7 Then a cloud overshadowed them, and from the cloud there came a voice, ‘This is my Son, the Beloved;[c] listen to him!’ 8 Suddenly when they looked around, they saw no one with them any more, but only Jesus.
9 As they were coming down the mountain, he ordered them to tell no one about what they had seen, until after the Son of Man had risen from the dead.