2 Peter 1:13-21 (ESV)

¹³ I think it right, as long as I am in this body, to stir you up by way of reminder, ¹⁴ since I know that the putting off of my body will be soon, as our Lord Jesus Christ made clear to me. ¹⁵ And I will make every effort so that after my departure you may be able at any time to recall these things.

¹⁶ For we did not follow cleverly devised myths when we made known to you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty. ¹⁷ For when he received honor and glory from God the Father, and the voice was borne to him by the Majestic Glory, “This is my beloved Son, with whom I am well pleased,” ¹⁸ we ourselves heard this very voice borne from heaven, for we were with him on the holy mountain. ¹⁹ And we have the prophetic word more fully confirmed, to which you will do well to pay attention as to a lamp shining in a dark place, until the day dawns and the morning star rises in your hearts, ²⁰ knowing this first of all, that no prophecy of Scripture comes from someone's own interpretation. ²¹ For no prophecy was ever produced by the will of man, but men spoke from God as they were carried along by the Holy Spirit.

Mark 9:2-9 (ESV)

² And after six days Jesus took with him Peter and James and John, and led them up a high mountain by themselves. And he was transfigured before them, ³ and his clothes became radiant, intensely white, as no one on earth could bleach them. ⁴ And there appeared to them Elijah with Moses, and they were talking with Jesus. ⁵ And Peter said to Jesus, “Rabbi, it is good that we are here. Let us make three tents, one for you and one for Moses and one for Elijah.” ⁶ For he did not know what to say, for they were terrified. ⁷ And a cloud overshadowed them, and a voice came out of the cloud, “This is my beloved Son; listen to him.” ⁸ And suddenly, looking around, they no longer saw anyone with them but Jesus only.

⁹ And as they were coming down the mountain, he charged them to tell no one what they had seen, until the Son of Man had risen from the dead.