Mark 9:6-8

Young's Literal Translation

⁶ for he was not knowing what he might say, for they were greatly afraid.

⁷ And there came a cloud overshadowing them, and there came a voice out of the cloud, saying, `This is My Son -- the Beloved, hear ye him;'

⁸ and suddenly, having looked around, they saw no one any more, but Jesus only with themselves.