(18) Mount Sinai was altogether on a smoke.--Heb., smoked, all of it. Some understand by this, "dense clouds, having the appearance of smoke." But if "the mountain burned with fire," as asserted (Deuteronomy 4:11), the smoke would be real.

The whole mount quaked greatly.--Comp. Psalm 68:8, "The earth shook, the heavens also dropped at the presence of God: even Sinai itself was moved at the presence of God." The expression is more suitable to an earthquake than to the vibration sometimes produced by very violent thunder.

Verse 18. - Mount Sinai was altogether on a smoke. Literally, smoked, all of it. Kalisch suggests that "the dense clouds from which the thunders broke forth had the appearance of smoke." But the reason assigned - "because the Lord descended on it in fire," seems to imply real smoke; and. the same re-suits from the comparison of it to "the smoke of a furnace." The whole mount quaked greatly. Scarcely "through the vehemence of the thunder" (Kalisch), for thunder does not shake the earth, though it shakes the air - but rather by an actual earthquake. Compare Psalm 18:7; Matthew 27:51-54; Acts 4:31; Acts 16:26.

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.And Mount Sinai was altogether on a smoke,.... Not from nature, as volcanos, but for a reason after given; it seemed to be one large body of smoke, nothing else to be seen but smoke; an emblem of the darkness of the legal dispensation, which was full of obscure types and figures, of dark shadows and smoky sacrifices, to which the clear day, of the Gospel dispensation is opposed, see 2 Corinthians 3:12.

because the Lord descended upon it in fire; in flaming fire, as the Targums, which set the mountain on fire, and caused this prodigious smoke; for if he, who is a consuming fire, but toucheth the hills and mountains, they smoke, Psalm 104:32.

and the smoke thereof ascended as the smoke of a furnace such an one as that which Abraham in vision saw, Genesis 15:17.

and the whole mount quaked greatly; to which circumstance Deborah refers in her song, when she speaks of mountains melting and flowing from before the presence of the God of Israel, and particularly of Sinai, Judges 5:4, and the psalmist, who makes mention of the earth shaking, and the heavens dropping, and of Sinai being moved at his presence, Psalm 68:8, it is probable there was an earthquake at this time, which sometimes attends thunders and lightnings, see Revelation 16:18.