Exodus 19:21-23

New Revised Standard Version, Anglicised Catholic Edition

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.’ ²³ Moses said to the Lord, ‘The people are not permitted to come up to Mount Sinai; for you yourself warned us, saying, “Set limits around the mountain and keep it holy.”’