Exodus 19:16 So it came about on the third day, when it was morning, that there were thunder and lightning flashes and a thick cloud upon the mountain and a very loud trumpet sound, so that all the people who were in the camp trembled.

Exodus 24:15 Then Moses went up to the mountain, and the cloud covered the mountain.

Exodus 24:16 The glory of the LORD rested on Mount Sinai, and the cloud covered it for six days; and on the seventh day He called to Moses from the midst of the cloud.

Deuteronomy 4:11 "You came near and stood at the foot of the mountain, and the mountain burned with fire to the very heart of the heavens: darkness, cloud and thick gloom.

Deuteronomy 4:12 "Then the LORD spoke to you from the midst of the fire; you heard the sound of words, but you saw no form-- only a voice.

Deuteronomy 4:36 "Out of the heavens He let you hear His voice to discipline you; and on earth He let you see His great fire, and you heard His words from the midst of the fire.

Psalm 99:7 He spoke to them in the pillar of cloud; They kept His testimonies And the statute that He gave them. (NASB ©1995)