18 And all the people perceived the thundering, and the flashes, and the voice of the trumpet, and the mountain smoking; and all the people feared and stood afar off,
Exodus 20:18 Cross References - CAB
Exodus 19:16-18
16 And it came to pass on the third day, as the morning drew nigh, there were voices and lightnings and a dark cloud on Mount Sinai. The voice of the trumpet sounded loud, and all the people in the camp trembled.
17 And Moses led the people forth out of the camp to meet God, and they stood by under the camp.
18 Now Mount Sinai was altogether in smoke, because God had descended upon it in fire; and the smoke went up like the smoke of a furnace, and the people were exceedingly amazed.
Psalms 139:7-8
Jeremiah 23:23
23 I am a God close at hand, says the Lord, and not a God afar off.