17 Then Moses brought the people out of the camp to meet God; and they took their stand at the foot of the mountain. 18 And Mount Sinai was wrapped in smoke, because the Lord descended upon it in fire; and the smoke of it went up like the smoke of a kiln, and the whole mountain quaked greatly. 19 And as the sound of the trumpet grew louder and louder, Moses spoke, and God answered him in thunder.