Exodus 19:10 - 19:15
10 Yahweh also said to Moses, “Go to the people and set them apart as holy today and tomorrow, and let them wash their garments; 11 and let them be ready for the third day, for on the third day Yahweh will come down on Mount Sinai in the sight of all the people. 12 And you shall set bounds for the people all around, saying, ‘Beware that you do not go up on the mountain or touch the border of it; whoever touches the mountain shall surely be put to death. 13 No hand shall touch him, but he shall surely be stoned or surely shot through; whether beast or man, he shall not live.’ When the ram’s horn sounds a long blast, they shall come up to the mountain.” 14 So Moses went down from the mountain to the people and set the people apart as holy, and they washed their garments. 15 And he said to the people, “Be ready for the third day; do not go near a woman.”