Exodus 19:12-19

12You must set boundaries for the people all around, saying, ‘Take heed to yourselves not to go up on the mountain nor touch its edge. Whoever touches the mountain will surely be put to death!

13No hand will touch him – but he will surely be stoned or shot through, whether a beast or a human being; he must not live.’ When the ram’s horn sounds a long blast they may go up on the mountain.”

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

15He said to the people, “Be ready for the third day. Do not go near your wives.”

16On the third day in the morning there was thunder and lightning and a dense cloud on the mountain, and the sound of a very loud horn; all the people who were in the camp trembled.

17Moses brought the people out of the camp to meet God, and they took their place at the foot of the mountain.

18Now Mount Sinai was completely covered with smoke because the Lord had descended on it in fire, and its smoke went up like the smoke of a great furnace, and the whole mountain shook violently.

19When the sound of the horn grew louder and louder, Moses was speaking and God was answering him with a voice.