Matthew 17:8

And lifting up their eyes, they saw no one, but Jesus only.

Mark 9:8

And suddenly looking round about, they saw no one any longer, but Jesus only with themselves.

Luke 9:36

And after the voice was gone they saw that Jesus was by himself. And they kept quiet, and said nothing at that time to anyone of the things which they had seen.

Acts 12:10-11

And when they had gone past the first and second watchmen they came to the iron door into the town, which came open by itself: and they went out and down one street; and then the angel went away.

Treasury of Scripture Knowledge

Summary

And when they had lifted up their eyes, they saw no man, save Jesus only.

Bible References

They saw

Mark 9:8
And suddenly looking round about, they saw no one any longer, but Jesus only with themselves.
Luke 9:36
And after the voice was gone they saw that Jesus was by himself. And they kept quiet, and said nothing at that time to anyone of the things which they had seen.
Acts 12:10
And when they had gone past the first and second watchmen they came to the iron door into the town, which came open by itself: and they went out and down one street; and then the angel went away.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain