30Suddenly two men, Moses and Elijah, began talking with Jesus.
31They appeared in glory and spoke about His departure, which He was about to accomplish at Jerusalem.
32Meanwhile Peter and his companions were overcome by sleep, but when they awoke, they saw Jesus’ glory and the two men standing with Him.
33As Moses and Elijah were leaving, Peter said to Jesus, “Master, it is good for us to be here. Let us put up three shelters — one for You, one for Moses, and one for Elijah.” (He did not know what he was saying.)
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!”
— Luke 9:30-35

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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.