Exodus 24:16-18

American Standard Version

¹⁶ And the glory of Jehovah abode upon mount Sinai, and the cloud covered it six days: and the seventh day he called unto Moses out of the midst of the cloud. ¹⁷ And the appearance of the glory of Jehovah was like devouring fire on the top of the mount in the eyes of the children of Israel. ¹⁸ And Moses entered into the midst of the cloud, and went up into the mount: and Moses was in the mount forty days and forty nights.