Deuteronomy 4:11
Tell your children how you went close and stood at the foot of the mountain covered with thick clouds of dark smoke and fire blazing up to the sky.
Deuteronomy 5:23
Fire blazed from the mountain, and you heard the voice coming from the darkness. Then your elders came to me.
Exodus 19:16-18
On the morning of the third day there were thunder and lightning flashes and a thick cloud upon the mountain. A very loud trumpet sounded. It caused all the people in the camp to tremble.
Exodus 20:18-19
The people heard the thunder and the trumpet blast. They saw the lightning and the smoking mountain. They trembled with fear and stood at a distance.
Hebrews 12:18-19
You have not come to a mountain that can be touched, to Mount Sinai with its blazing fire, the darkness and the gloom, the storm.