Mark 9:2-6

2Six 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];

3and His clothes became radiant and dazzling, intensely white, as no launderer on earth can whiten them.

4Elijah appeared to them along with Moses, and they were having a conversation with Jesus.

5Peter 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.”

6For he did not [really] know what to say because they were terrified [and stunned by the miraculous sight].