Hebrews 12:18
For you have not come to a mountain that can be touched and that is burning with fire; to darkness, gloom, and storm;

Hebrews 12:19
to a trumpet blast or to a voice that made its hearers beg that no further word be spoken.

Exodus 19:9
The LORD said to Moses, "Behold, I will come to you in a dense cloud, so that the people will hear when I speak with you, and they will always put their trust in you." And Moses relayed the words of the people to the LORD.

Exodus 19:18
Mount Sinai was completely enveloped in smoke, because the LORD had descended on it in fire. And smoke rose like the smoke of a furnace, and the whole mountain quaked violently.

Deuteronomy 4:12
And the LORD spoke to you out of the fire. You heard the sound of the words, but saw no form; there was only a voice.

Psalm 18:11
He made darkness His hiding place, and storm clouds a canopy around Him.

Psalm 97:2
Clouds and darkness surround Him; righteousness and justice are His throne's foundation.