Exodus 19:9-19

9 ADONAI said to Moshe, "See, I am coming to you in a thick cloud, so that the people will be able to hear when I speak with you and also to trust in you forever."Moshe had told ADONAI what the people had said;
10 so ADONAI said to Moshe, "Go to the people; today and tomorrow separate them for me by having them wash their clothing;
11 and prepare for the third day. For on the third day, ADONAI will come down on Mount Sinai before the eyes of all the people.
12 You are to set limits for the people all around; and say, 'Be careful not to go up on the mountain or even touch its base; whoever touches the mountain will surely be put to death.
13 No hand is to touch him; for he must be stoned or shot by arrows; neither animal nor human will be allowed to live.' When the shofar sounds, they may go up on the mountain."
14 Moshe went down from the mountain to the people and separated the people for God, and they washed their clothing.
15 He said to the people, "Prepare for the third day; don't approach a woman."
16 On the morning of the third day, there was thunder, lightning and a thick cloud on the mountain. Then a shofar blast sounded so loudly that all the people in the camp trembled.
17 Moshe brought the people out of the camp to meet God; they stood near the base of the mountain.
18 Mount Sinai was enveloped in smoke, because ADONAI descended onto it in fire -its smoke went up like the smoke from a furnace, and the whole mountain shook violently.
19 As the sound of the shofar grew louder and louder, Moshe spoke; and God answered him with a voice.
Complete Jewish Bible Copyright 1998 by David H. Stern. Published by Jewish New Testament Publications, Inc. All rights reserved. Used by permission.