Luke 9:34
And while he was speaking, a cloud appeared and engulfed them and the apostles were afraid as Moses and Elijah entered the cloud [i.e., and disappeared].
Matthew 17:5-7
While he was still talking, suddenly a bright cloud engulfed them. Just then, a voice spoke out of the cloud, saying, "This is my dearly loved Son, who is very pleasing to me; listen to Him."
Mark 9:7-8
[Just then] a cloud engulfed them and a voice spoke out of the cloud saying, "This is my dearly loved Son, listen to Him."
Revelation 1:17
And when I saw Him, I fell at His feet as [though I were] dead. And He placed His right hand on me and said, "Do not be afraid; I am the First and the Last,