Exodus 24:18 in the King James Version
And Moses went into the midst of the cloud, and gat him up into the mount: and Moses was in the mount forty days and forty nights.
Context
17 The appearance of the LORD’s glory was like devouring fire on the top of the mountain in the eyes of the children of Israel.
18 Moses entered into the middle of the cloud, and went up on the mountain; and Moses was on the mountain forty days and forty nights.