Exodus 19:21 in the King James Version
And the LORD said unto Moses, Go down, charge the people, lest they break through unto the LORD to gaze, and many of them perish.
Context
20 The LORD came down on Mount Sinai, to the top of the mountain. The LORD called Moses to the top of the mountain, and Moses went up.
21 The LORD said to Moses, “Go down, warn the people, lest they break through to the LORD to gaze, and many of them perish.
22 Let the priests also, who come near to the LORD, sanctify themselves, lest the LORD break out on them.”