Exodus 19:20-22

New Revised Standard Version, Anglicised

²⁰ When the Lord descended upon Mount Sinai, to the top of the mountain, the Lord summoned Moses to the top of the mountain, and Moses went up. ²¹ Then the Lord said to Moses, ‘Go down and warn the people not to break through to the Lord to look; otherwise many of them will perish. ²² Even the priests who approach the Lord must consecrate themselves or the Lord will break out against them.’