Mark 9:2-7

Six days later, Jesus took with Him Peter and James and John, and led them up on a high mountain by themselves. And He was transfigured (changed in form) before them [and began to shine brightly with divine and regal glory]; [Matt 17:1-8; Luke 9:28-36] and His clothes became radiant and dazzling, intensely white, as no launderer on earth can whiten them. Elijah appeared to them along with Moses, and they were having a conversation with Jesus. Peter responded and said to Jesus, “Rabbi (Master), it is good for us to be here; let us make three [sacred] tents—one for You, and one for Moses, and one for Elijah.” For he did not [really] know what to say because they were terrified [and stunned by the miraculous sight]. Then a cloud formed, overshadowing them, and a voice came out of the cloud, “This is My beloved Son. Listen to Him and obey Him!”