Exodus 19
16 Ref 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.
17 Ref And Moses made the people come out of their tents and take their places before God; and they came to the foot of the mountain,
18 Ref And all the mountain of Sinai was smoking, for the Lord had come down on it in fire: and the smoke of it went up like the smoke of a great burning; and all the mountain was shaking.
19 Ref And when the sound of the horn became louder and louder, Moses' words were answered by the voice of God.
20 Ref Then the Lord came down on to Mount Sinai, to the top of the mountain, and the Lord sent for Moses to come up to the top of the mountain, and Moses went up.