Exodus 19:9-16

9Then the Lord said to Moses, “Behold, I will come to you in 1a thick cloud, so that the 2people may hear when I speak with you and may also trust in you forever.” Then Moses told the words of the people to the Lord.

10The Lord also said to Moses, “Go to the people and 3consecrate them today and tomorrow, and have them 4wash their garments; 11and have them ready for the third day, for on 5the third day the Lord will come down on Mount Sinai in the sight of all the people. 12But you shall set boundaries for the people all around, saying, ‘6Beware that you do not go up on the mountain or touch the border of it; 7whoever touches the mountain shall certainly be put to death. 13No hand shall touch him, but 8he shall certainly be stoned or 9shot through; whether animal or person, the violator shall not live.’ When the ram’s horn sounds a long blast, they shall come up to 10the mountain.” 14So Moses went down from the mountain to the people and consecrated the people, and they washed their garments. 15He also said to the people, “Be ready for the third day; do not go near a woman.”

1611So it came about on the third day, when it was morning, that there were 12thunder and lightning flashes and a thick cloud over the mountain and a very loud trumpet sound, so that all the people who were in the camp trembled.