Exodus 19:16-18

Revised Standard Version Catholic Edition

¹⁶ On the morning of the third day there were thunders and lightnings, and a thick cloud upon the mountain, and a very loud trumpet blast, so that all the people who were in the camp trembled. 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.