Exodus 19:21-25

And Jehovah said unto Moses, Go down, charge the people, lest they break through unto Jehovah to gaze, and many of them perish. And let the priests also, that come near to Jehovah, sanctify themselves, lest Jehovah break forth upon them. And Moses said unto Jehovah, The people cannot come up to mount Sinai: for thou didst charge us, saying, Set bounds about the mount, and sanctify it. And Jehovah said unto him, Go, get thee down; and thou shalt come up, thou, and Aaron with thee: but let not the priests and the people break through to come up unto Jehovah, lest he break forth upon them. So Moses went down unto the people, and told them.