Exodus 19:18-20

Thomson(i) 18 The whole mountain Sina was enveloped with smoke, because God had descended upon it in fire. And the smoke ascended like the smoke of a furnace, so that all the people were exceedingly amazed. 19 Still the sounds of the trumpet waxed louder and louder. Moses had spoken and God had answered him by a voice. 20 And the Lord descended upon mount Sina on the summit of the mount, and the Lord called Moses up to the top of the mount, and Moses went up.