Luke 9:36
And after the voice had spoken, Jesus was found alone. But the apostles kept quiet [about this incident], and did not tell anyone at that time about anything they had seen.
Matthew 17:9
And as they were coming down from the mountain, Jesus ordered them, saying, "Do not tell anyone about the vision [you have just seen] until the Son of man has been raised from the dead."
Mark 9:6
For he did not know what to say, because they [all] became very afraid.
Mark 9:9-10
And as they were coming down from the mountain Jesus ordered His disciples not to tell anyone what they had seen until [after] the Son of man was raised again from the dead.