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.
There is a time to tear apart and a time to sew together. There is a time to be silent and a time to speak.
As they were coming down the mountain, Jesus commanded them not to tell anyone about what they had seen until the Son of Man had risen from the dead.
Peter did not know what to say, because he and the others were so frightened.