Exodus 19:20-22

American Standard Version

²⁰ And Jehovah came down upon mount Sinai, to the top of the mount: and Jehovah called Moses to the top of the mount; and Moses went up. ²¹ And Jehovah said unto Moses, Go down, charge the people, lest they break through unto Jehovah to gaze, and many of them perish. ²² And let the priests also, that come near to Jehovah, sanctify themselves, lest Jehovah break forth upon them.