Deuteronomy 4:11
And you came near, waiting at the foot of the mountain; and flames of fire went up from the mountain to the heart of heaven, with dark clouds, and all was black as night.
Deuteronomy 5:23
And after hearing the voice which came out of the dark while the mountain was burning with fire, all the heads of your tribes and your chiefs came to me,
Exodus 19:16-18
And when morning came on the third day, there were thunders and flames and a thick cloud on the mountain, and a horn sounding very loud; and all the people in the tents were shaking with fear.
Exodus 20:18-19
And all the people were watching the thunderings and the flames and the sound of the horn and the mountain smoking; and when they saw it, they kept far off, shaking with fear.
Hebrews 12:18-19
You have not come to a mountain which may be touched, and is burning with fire, and to a black cloud, and a dark smoke, and a violent wind,