Mark 9:2-9

After six days Jesus took Peter, James, and John and led them up on a high mountain by themselves to be alone. He was transformed in front of them, and His clothes became dazzling — extremely white as no launderer on earth could whiten them. Elijah appeared to them with Moses, and they were talking with Jesus. Then Peter said to Jesus, “Rabbi, it’s good for us to be here! Let us make three tabernacles: one for You, one for Moses, and one for Elijah” — because he did not know what he should say, since they were terrified. A cloud appeared, overshadowing them, and a voice came from the cloud: This is My beloved Son; listen to Him! Then suddenly, looking around, they no longer saw anyone with them except Jesus alone. As they were coming down from the mountain, He ordered them to tell no one what they had seen until the Son of Man had risen from the dead.