Exodus 19:21-23

Amplified Bible, Classic Edition

²¹ The Lord said to Moses, Go down and warn the people, lest they break through to the Lord to gaze and many of them perish.

²² And also let the priests, who come near to the Lord, sanctify (set apart) themselves [for God], lest the Lord break forth against them.

²³ And Moses said to the Lord, The people cannot come up to Mount Sinai, for You Yourself charged us, saying, Set bounds about the mountain and sanctify it [set it apart for God].