Exodus 19:16

Yahweh said to Moses, “Behold, I will come to you in a thick cloud, so that the people may hear when I speak with you and may also believe in you forever.” Then Moses told the words of the people to Yahweh.

and let them be ready for the third day, for on the third day Yahweh will come down on Mount Sinai in the sight of all the people.

And all the people perceived the thunder and the lightning flashes and the sound of the trumpet and the mountain smoking; and the people perceived it, and they shook and stood at a distance.

So the people stood at a distance, but Moses came near the dense gloom where God was.

I was standing between Yahweh and you at that time, to declare to you the word of Yahweh; for you were afraid because of the fire and did not go up the mountain. He said,

“He bowed the heavens and came down With thick darkness under His feet.

His lightnings light up the world; The earth sees and trembles.

Yahweh is slow to anger and great in power, And Yahweh will by no means leave the guilty unpunished. In whirlwind and storm is His way, And clouds are the dust beneath His feet.

“And He will send forth His angels with a great trumpet and they will gather together His elect from the four winds, from one end of the sky to the other.

For you have not come to a mountain that can be touched and to a blazing fire, and to darkness and gloom and whirlwind,

and to the blast of a trumpet and the sound of words which was such that those who heard begged that no further word be spoken to them.

And out from the throne come flashes of lightning and sounds and peals of thunder. And there were seven lamps of fire burning before the throne, which are the seven Spirits of God.

Then the angel took the censer and filled it with the fire of the altar, and threw it to the earth; and there followed peals of thunder and sounds and flashes of lightning and an earthquake.