Exodus 24:16-18

Revised Standard Version

¹⁶ The glory of the Lord settled on Mount Sinai, and the cloud covered it six days; and on the seventh day he called to Moses out of the midst of the cloud. ¹⁷ Now the appearance of the glory of the Lord was like a devouring fire on the top of the mountain in the sight of the people of Israel. ¹⁸ And Moses entered the cloud, and went up on the mountain. And Moses was on the mountain forty days and forty nights.