12 The Lord said to Moses, “Come up to me on the mountain and wait there; I will give you the tablets of stone, with the law and the commandment, which I have written for their instruction.” 13 So Moses set out with his assistant Joshua, and Moses went up onto the mountain of God. 14 To the elders he had said, “Wait here for us, until we come back to you. Look, Aaron and Hur are with you; whoever has a dispute may go to them.” 15 Then Moses went up on the mountain, and the cloud covered the mountain. 16 The glory of the Lord settled on Mount Sinai, and the cloud covered it for six days; on the seventh day he called to Moses out of the cloud. 17 Now the appearance of the glory of the Lord was like a devouring fire on the top of the mountain in the sight of the Israelites. 18 Moses entered the cloud and went up on the mountain. Moses was on the mountain for forty days and forty nights.
The painting to the right is The Transfiguration, by Giovanni Battista Moroni
28 About eight days after Jesus said these things, he took Peter, John, and James and went up on a mountain to pray. 29 While Jesus was praying, the appearance of his face changed, and his clothes became dazzling white. 30 Then two men, Moses and Elijah, were talking with Jesus. 31 They appeared in heavenly glory, talking about his departure which he would soon bring about in Jerusalem. 32 Peter and the others were very sleepy, but when they awoke fully, they saw the glory of Jesus and the two men standing with him. 33 When Moses and Elijah were about to leave, Peter said to Jesus, “Master, it is good that we are here. Let us make three tents—one for you, one for Moses, and one for Elijah.” (Peter did not know what he was talking about.) 34 While he was saying these things, a cloud came and covered them, and they became afraid as the cloud covered them. 35 A voice came from the cloud, saying, “This is my Son, whom I have chosen. Listen to him!” 36 When the voice finished speaking, only Jesus was there. Peter, John, and James said nothing and told no one at that time what they had seen.