Mark 9:3-7

and His garments became radiant and exceedingly white, as no launderer on earth can whiten them.

And Elijah appeared to them along with Moses; and they were talking with Jesus.

Peter responded and *said to Jesus, “Rabbi, it is good that we are here; let’s make three tabernacles, one for You, one for Moses, and one for Elijah.”

For he did not know how to reply; for they became terrified.

Then a cloud formed, overshadowing them, and a voice came out of the cloud: “This is My beloved Son; listen to Him!”