Exodus 19:21-25

And the LORD said to Moses, “Go down and warn the people, lest they break through to gaze at the LORD, and many of them perish. Also let the priests who come near the LORD consecrate themselves, lest the LORD break out against them.” But Moses said to the LORD, “The people cannot come up to Mount Sinai; for You warned us, saying, ‘Set bounds around the mountain and consecrate it.’ ” Then the LORD said to him, “Away! Get down and then come up, you and Aaron with you. But do not let the priests and the people break through to come up to the LORD, lest He break out against them.” So Moses went down to the people and spoke to them.