Exodus 19:17-19

New Revised Standard Version, Anglicised

¹⁷ Moses brought the people out of the camp to meet God. They took their stand at the foot of the mountain. ¹⁸ Now Mount Sinai was wrapped in smoke, because the Lord had descended upon it in fire; the smoke went up like the smoke of a kiln, while the whole mountain shook violently. ¹⁹ As the blast of the trumpet grew louder and louder, Moses would speak and God would answer him in thunder.