Exodus 24:16-18

New Revised Standard Version, Anglicised

¹⁶ The glory of the Lord settled on Mount Sinai, and the cloud covered it for six days; on the seventh day he called to Moses out 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 Moses entered the cloud, and went up on the mountain. Moses was on the mountain for forty days and forty nights.