Exodus 19:18-21

18All of Mount Sinai was covered with smoke because the Lord had come down on it in fire. Smoke rose from the mountain like the smoke from a kiln, and the whole mountain shook violently.

19As the sound of the horn grew louder and louder, Moses was speaking, and the voice of God answered him.

20The Lord came down on top of Mount Sinai and called Moses to the top of the mountain. So Moses went up.

21The Lord said to him, “Go down and warn the people not to force their way through ⌞the boundary⌟ to see the Lord, or many of them will die.