Exodus 24:15-17

American Standard Version

¹⁵ And Moses went up into the mount, and the cloud covered the mount. 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.