Exodus 19:20-22

New Century Version

²⁰ When the Lord came down on top of Mount Sinai, he called Moses to come up to the top of the mountain, and Moses went up. ²¹ The Lord said to Moses, “Go down and warn the people that they must not force their way through to see me. If they do, many of them will die. ²² Even the priests, who may come near me, must first prepare themselves. If they don’t, I, the Lord, will punish them.”