Mark 9:5-8

And Peter answereth and saith to Jesus, Rabbi, it is good for us to be here: and let us make three tabernacles; one for thee, and one for Moses, and one for Elijah. For he knew not what to answer; for they became sore afraid. And there came a cloud overshadowing them: and there came a voice out of the cloud, This is my beloved Son: hear ye him. And suddenly looking round about, they saw no one any more, save Jesus only with themselves.