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. 18 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. 19 And when the voice of the trumpet sounded long, and waxed louder and louder, Moses spake, and God answered him by a voice.
[Patriarchs And Prophets pp. 303> 305] God purposed to make the occasion of speaking His law a scene of awful grandeur, in keeping with its exalted character. The people were to be impressed that everything connected with the service of God must be regarded with the greatest reverence. The Lord said to Moses, “Go unto the people, and sanctify them today and tomorrow, and let them wash their clothes, 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.” During these intervening days all were to occupy the time in solemn preparation to appear before God. Their person and their clothing must be freed from impurity.
And as Moses should point out their sins, they were to devote themselves to humiliation, fasting, and prayer, that their hearts might be cleansed from iniquity. The preparations were made, according to the command; and in obedience to a further injunction, Moses directed that a barrier be placed about the mount, that neither man nor beast might intrude upon the sacred precinct. 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.”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.
Moses, describing the scene, says: “The Lord came from Sinai, and rose up from Seir unto them; He shined forth from Mount Paran, and He came with ten thousands of saints: from His right hand went a fiery law for them. Yea, He loved the people; all His saints are in Thy hand: and they sat down at Thy feet; every one shall receive of Thy words.”
Jehovah revealed Himself, not alone in the awful majesty of the judge and lawgiver, but as the compassionate guardian of His people: “I am the Lord thy God, which have brought thee out of the land of Egypt, out of the house of bondage.” He whom they had already known as their Guide and Deliverer, who had brought them forth from Egypt, making a way for them through the sea, and overthrowing Pharaoh and his hosts, who had thus shown Himself to be above all the gods of Egypt—He it was who now spoke His law.
Exodus 20:18 And all the people saw the thunderings, and the lightnings, and the noise of the trumpet, and the mountain smoking: and when the people saw it, they removed, and stood afar off. 19 And they said unto Moses, Speak thou with us, and we will hear: but let not God speak with us, lest we die. 20 And Moses said unto the people, Fear not: for God is come to prove you, and that his fear may be before your faces, that ye sin not.
May God add His blessing to the study of His word. "Good night" and God bless!