Exodus 24:12-18

12And the LORD said to Moses, Come up to me on the mount, and be there: and I will give thee tables of stone, and a law, and commandments which I have written; that thou mayest teach them. 13And Moses rose up, and his servant Joshua: and Moses went up upon the mount of God. 14And he said to the elders, Tarry ye here for us, until we come again to you: and, behold, Aaron and Hur are with you: if any man hath any matters to do, let him come to them. 15And Moses went up upon the mount, and a cloud covered the mount. 16And the glory of the LORD abode upon mount Sinai, and the cloud covered it six days: and the seventh day he called to Moses from the midst of the cloud. 17And the sight of the glory of the LORD was like devouring fire on the top of the mount in the eyes of the children of Israel. 18And Moses went into the midst of the cloud, and he went up to the mount: and Moses was on the mount forty days and forty nights.