Mark 9:2-8

And after six days, Jesus took along Peter and James and John, and led them to a high mountain by themselves alone. And he was transfigured before them, and his clothing became radiant—extremely white, like no cloth refiner on earth can make so white. And Elijah appeared to them together with Moses, and they were talking with Jesus. And Peter answered and said to Jesus, “Rabbi, it is good that we are here! And let us make three shelters, one for you and one for Moses and one for Elijah.” (For he did not know what he should answer, because they were terrified.) And a cloud came, overshadowing them, and a voice came from the cloud, “This is my beloved Son. Listen to him!” And suddenly, looking around, they no longer saw anyone with them but Jesus alone.