Mark 9:4-8

And there appeared before them Elijah and Moses, who were talking with Jesus. Peter said to Jesus, “Rabbi, it is good for us to be here. Let us put up three shelters—one for you, one for Moses and one for Elijah.” (He did not know what to say, they were so frightened.) Then a cloud appeared and covered them, and a voice came from the cloud: “This is my Son, whom I love. Listen to him!” Suddenly, when they looked around, they no longer saw anyone with them except Jesus.