The Lord said to Moses, ‘Come up to me on the mountain and stay there so that I may give you the stone tablets with the law and commandments I have written for their instruction.’
And the Lord replied to him, ‘Go down and come back with Aaron. But the priests and the people must not break through to come up to the Lord, or he will break out in anger against them.’
Mount Sinai was completely enveloped in smoke because the Lord came down on it in fire. Its smoke went up like the smoke of a furnace, and the whole mountain shook violently.