Exodus 19:17-19

JPS_ASV_Byz(i) 17 And Moses brought forth the people out of the camp to meet God; and they stood at the nether part of the mount. 18 Now mount Sinai was altogether on smoke, because the LORD descended upon it in fire; and the smoke thereof ascended as the smoke of a furnace, and the whole mount quaked greatly. 19 And when the voice of the horn waxed louder and louder, Moses spoke, and God answered him by a voice.