The Lord came down - This was undoubtedly done in a visible manner, that the people might witness the awful appearance. We may suppose that every thing was arranged thus: the glory of the Lord occupied the top of the mountain, and near to this Moses was permitted to approach. Aaron and the seventy elders were permitted to advance some way up the mountain, while the people were only permitted to come up to its base. Moses, as the lawgiver, was to receive the statutes and judgments from God's mouth; Aaron and the elders were to receive them from Moses, and deliver them to the people; and the people were to act according to the direction received. Nothing can be imagined more glorious, terrible, majestic, and impressive, than the whole of this transaction; but it was chiefly calculated to impress deep reverence, religious fear, and sacred awe; and he who attempts to worship God uninfluenced by these, has neither a proper sense of the Divine majesty, nor of the sinfulness of sin. It seems in reference to this that the apostle says, Let us have grace whereby we may serve God acceptably with Reverence and Godly Fear: for our God is a Consuming Fire; Hebrews 12:28, Hebrews 12:29. Who then shall dare to approach him in his own name and without a mediator?

And the Lord came down on Mount Sinai,.... In the above visible tokens of his presence and power; otherwise he is the incomprehensible Jehovah, that immense and omnipotent Being, who fills heaven and earth, and cannot be contained and circumscribed in either:

on the top of the mount; where the fire he descended in rested, and where the smoke and thick cloud were, as a token of his presence:

and the Lord called Moses up to the top of the mount; who either was at the bottom of it with the people, or in a higher ascent of it between God and them:

and Moses went up; to the top of it, where the Lord was, as he ordered him: a certain traveller (y) tells us that the top of this mount was scarce thirty feet in circumference.

(y) Baumgarten Peregrinatio, l. 1. c. 24. p. 61.

And the LORD came down upon mount Sinai, on the top of the mount: and the LORD called Moses up to the top of the mount; and Moses went up.

19:16-25 Never was there such a sermon preached, before or since, as this which was preached to the church in the wilderness. It might be supposed that the terrors would have checked presumption and curiosity in the people; but the hard heart of an unawakened sinner can trifle with the most terrible threatenings and judgments. In drawing near to God, we must never forget his holiness and greatness, nor our own meanness and pollution. We cannot stand in judgment before him according to his righteous law. The convinced transgressor asks, What must I do to be saved? and he hears the voice, Believe in the Lord Jesus Christ, and thou shalt be saved. The Holy Ghost, who made the law to convince of sin, now takes of the things of Christ, and shows them to us. In the gospel we read, Christ hath redeemed us from the curse of the law, being made a curse for us. We have redemption through his blood, even the forgiveness of sins. Through him we are justified from all things, from which we could not be justified by the law of Moses. But the Divine law is binding as a rule of life. The Son of God came down from heaven, and suffered poverty, shame, agony, and death, not only to redeem us from its curse, but to bind us more closely to keep its commands.