Mark 9:2-9 NRSV

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 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, 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; 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.