Exodus 19:10

6and you shall be to me a kingdom of priests and a holy nation.’ These are the words which you shall speak to the children of Israel.”

7Moses came and called for the elders of the people, and set before them all these words which the LORD commanded him.

8All the people answered together, and said, “All that the LORD has spoken we will do.” Moses reported the words of the people to the LORD.

9The LORD said to Moses, “Behold, I come to you in a thick cloud, that the people may hear when I speak with you, and may also believe you forever.” Moses told the words of the people to the LORD.

10The LORD said to Moses, “Go to the people, and sanctify them today and tomorrow, and let them wash their garments,

11and be ready for the third day; for on the third day the LORD will come down in the sight of all the people on Mount Sinai.

12You shall set bounds to the people all around, saying, ‘Be careful that you don’t go up onto the mountain, or touch its border. Whoever touches the mountain shall be surely put to death.

13No hand shall touch him, but he shall surely be stoned or shot through; whether it is animal or man, he shall not live.’ When the trumpet sounds long, they shall come up to the mountain.”

14Moses went down from the mountain to the people, and sanctified the people; and they washed their clothes.