Deuteronomy 4:11
And you came near and stood at the foot of the mountain, while the mountain burned with fire to the heart of heaven, wrapped in darkness, cloud, and gloom.
Deuteronomy 5:23
And as soon as you heard the voice out of the midst of the darkness, while the mountain was burning with fire, you came near to me, all the heads of your tribes, and your elders.
Exodus 19:16-18
On the morning of the third day there were thunders and lightnings and a thick cloud on the mountain and a very loud trumpet blast, so that all the people in the camp trembled.
Exodus 20:18-19
Now when all the people saw the thunder and the flashes of lightning and the sound of the trumpet and the mountain smoking, the people were afraid and trembled, and they stood far off
Hebrews 12:18-19
For you have not come to what may be touched, a blazing fire and darkness and gloom and a tempest