34While Peter was speaking, a cloud appeared and enveloped them, and they were afraid as they entered the cloud.
35And a voice came from the cloud, saying, “This is My Son, whom I have chosen. Listen to Him!”
36After the voice had spoken, only Jesus was present with them. The disciples kept this to themselves, and in those days they did not tell anyone what they had seen.
— Luke 9:34-36

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Illustration of Luke 9:35-36 NLT

Illustration of Luke 9:35-36 NLT -- Then a voice from the cloud said, "This is my Son, my Chosen One. Listen to him." When the voice finished, Jesus was there alone. [The disciples] didn't tell anyone at that time what they had seen.