Exodus 19:22-24

22Also have the 1priests who approach the Lord consecrate themselves, or else the Lord will break out against them.”

23And Moses said to the Lord, “The people cannot come up to Mount Sinai, for You 2warned us, saying, ‘3Set boundaries around the mountain and consecrate it.’”

24Then the Lord said to him, “4Go down and come up again, 5you and Aaron with you; but do not let the 6priests and the people break through to come up to the Lord, or He will break out against them.”