Mark 9:4-6

Young's Literal Translation

⁴ And there appeared to them Elijah with Moses, and they were talking with Jesus.

⁵ And Peter answering saith to Jesus, `Rabbi, it is good to us to be here; and we may make three booths, for thee one, and for Moses one, and for Elijah one:'

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