Mark 9:6

His clothing became glistening, exceedingly white, like snow, such as no launderer on earth can whiten them.

Elijah and Moses appeared to them, and they were talking with Jesus.

Peter answered Jesus, “Rabbi, it is good for us to be here. Let’s make three tents: one for you, one for Moses, and one for Elijah.”

A cloud came, overshadowing them, and a voice came out of the cloud, “This is my beloved Son. Listen to him.”

Suddenly looking around, they saw no one with them any more, except Jesus only.

As they were coming down from the mountain, he commanded them that they should tell no one what things they had seen, until after the Son of Man had risen from the dead.