John Damascene
Catena Aurea · Lukasevangelium 9
But Peter and they that were with him were heavy with sleep: and when they were awake, they saw his glory, and the two men that stood with him. And it came to pass, as they departed from him, Peter said unto Jesus, Master, it is good for us to be here: and let us make three tabernacles; one for thee, and one for Moses, and one for Elias: not knowing what he said. While he thus spake, there came a cloud, and overshadowed them: and they feared as they entered into the cloud. And there came a voice out of the cloud, saying, This is my beloved Son: hear him. And when the voice was past, Jesus was found alone. And they kept it close, and told no man in those days any of those things which they had seen.
(ubi sup.) This also our Lord commands, since He knew His disciples to be imperfect, seeing that they had not yet received the full measure of the Spirit, lest the hearts of others who had not seen should be prostrated by sorrow, and lest the traitor should be stirred up to a frantic hatred.