Exodus 19:10 And the Lord said unto Moses, Go unto the people, and sanctify them to day and to morrow, and let them wash their clothes, 11 And be ready against the third day: for the third day the Lord will come down in the sight of all the people upon mount Sinai.
[Patriarchs & Prophets pp 304] On the morning of the third day, as the eyes of all the people were turned toward the mount, its summit was covered with a thick cloud, which grew more black and dense, sweeping downward until the entire mountain was wrapped in darkness and awful mystery. Then a sound as of a trumpet was heard, summoning the people to meet with God; and Moses led them forth to the base of the mountain. From the thick darkness flashed vivid lightnings, while peals of thunder echoed and re-echoed among the surrounding heights.
“And Mount Sinai was altogether on a smoke, because the Lord descended upon it in fire: and the smoke thereof ascended as the smoke of a furnace, and the whole mount quaked greatly.” “The glory of the Lord was like devouring fire on the top of the mount” in the sight of the assembled multitude. And “the voice of the trumpet sounded long, and waxed louder and louder.” So terrible were the tokens of Jehovah's presence that the hosts of Israel shook with fear, and fell upon their faces before the Lord.
Even Moses exclaimed, “I exceedingly fear and quake.” Hebrews 12:21. And now the thunders ceased; the trumpet was no longer heard; the earth was still. There was a period of solemn silence, and then the voice of God was heard. Speaking out of the thick darkness that enshrouded Him, as He stood upon the mount, surrounded by a retinue of angels, the Lord made known His law.
Exodus 19:16 And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that was in the camp trembled.
May God add His blessing to the study of His word. “Good night” and God bless!