Exodus 19:9-16

⁹Then the Lord said to Moses, “Behold, I will come to you in a thick cloud, so that the people 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 consecrate them today and tomorrow, and have them wash their garments; ¹¹and have them ready for the third day, for on the 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, ‘Beware that you do not go up on the mountain or touch the border of it; whoever touches the mountain shall certainly be put to death. ¹³No hand shall touch him, but he shall certainly be stoned or shot through; whether animal or person, the violator shall not live.’ When the ram’s horn sounds a long blast, they shall come up to the 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.”

¹⁶So it came about on the third day, when it was morning, that there were thunder 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.