Exodus 19:23-25

23“But Lord,” Moses protested, “the people cannot come up to Mount Sinai. You already warned us. You told me, ‘Mark off a boundary all around the mountain to set it apart as holy.’”

24But the Lord said, “Go down and bring Aaron back up with you. In the meantime, do not let the priests or the people break through to approach the Lord, or he will break out and destroy them.”

25So Moses went down to the people and told them what the Lord had said.