Luke 9:33
As the men were leaving Jesus, Peter said to him, master, it is good for us to be here. Let us put up three shelters — one for you, one for Moses and one for Elijah. (He did not know what he was saying.) — Peter's proposal comes as Moses and Elijah are leaving — the intervention tries to extend the moment. He did not know what he was saying: Luke's explanation of Peter's inappropriate proposal. The three-shelter proposal treats Moses and Elijah as equals with Jesus, which the voice from the cloud will immediately correct.