Exodus 19:18

19:18 Now Mount Sinai was completely covered with smoke because the Lord had descended on it in fire, and its smoke went up like the smoke of a great furnace, and the whole mountain shook violently.

Exodus 20:18

20:18 All the people were seeing the thundering and the lightning, and heard the sound of the horn, and saw the mountain smoking – and when the people saw it they trembled with fear and kept their distance.

Deuteronomy 4:11-12

4:11 You approached and stood at the foot of the mountain, a mountain ablaze to the sky above it and yet dark with a thick cloud. 4:12 Then the Lord spoke to you from the middle of the fire; you heard speech but you could not see anything – only a voice was heard.

Deuteronomy 5:22-25

The Narrative of the Sinai Revelation and Israel’s Response

5:22 The Lord said these things to your entire assembly at the mountain from the middle of the fire, the cloud, and the darkness with a loud voice, and that was all he said. Then he inscribed the words on two stone tablets and gave them to me. 5:23 Then, when you heard the voice from the midst of the darkness while the mountain was ablaze, all your tribal leaders and elders approached me. 5:24 You said, “The Lord our God has shown us his great glory and we have heard him speak from the middle of the fire. It is now clear to us that God can speak to human beings and they can keep on living. 5:25 But now, why should we die, because this intense fire will consume us! If we keep hearing the voice of the Lord our God we will die!

Hebrews 12:18

12:18 For you have not come to something that can be touched, to a burning fire and darkness and gloom and a whirlwind