Luke 9:34-36

But even as he was saying this, a cloud formed and began to overshadow them; and they were [greatly] afraid as they entered the cloud. Then a voice came out of the cloud, saying, “This is My beloved Son, My Chosen One; listen and obey and yield to Him!” When the voice had ceased, Jesus was found there alone. And they kept silent, and told no one at that time any of the things which they had seen [concerning the divine manifestation]. [2 Pet 1:16-19]