(For they could not endure that which was commanded, And if so much as a beast touch the mountain, it shall be stoned, or thrust through with a dart:

People's New Testament

12:20 For they could not endure that which was commanded. The command and penalty added to their terror (Ex 19:12).

Wesley's Notes

12:20 For they could not bear - The terror which seized them, when they heard those words proclaimed, If even a beast, and c. Exod 19:12, and c.

Jamieson-Fausset-Brown Bible Commentary

20. that which was commanded-"the interdict" [Tittmann]. A stern interdictory mandate is meant.

And-rather, "Even if a beast (much more a man) touch," &c.

or thrust through with a dart-omitted in the oldest manuscripts. The full interdict in Ex 19:12, 13 is abbreviated here; the beast alone, being put for "whether man or beast"; the stoning, which applies to the human offender, alone being specified, the beast's punishment, namely, the being thrust through with a dart, being left to be understood.

Matthew Henry's Concise Commentary

12:18-29 Mount Sinai, on which the Jewish church state was formed, was a mount such as might be touched, though forbidden to be so, a place that could be felt; so the Mosaic dispensation was much in outward and earthly things. The gospel state is kind and condescending, suited to our weak frame. Under the gospel all may come with boldness to God's presence. But the most holy must despair, if judged by the holy law given from Sinai, without a Saviour. The gospel church is called Mount Zion; there believers have clearer views of heaven, and more heavenly tempers of soul. All the children of God are heirs, and every one has the privileges of the first-born. Let a soul be supposed to join that glorious assembly and church above, that is yet unacquainted with God, still carnally-minded, loving this present world and state of things, looking back to it with a lingering eye, full of pride and guile, filled with lusts; such a soul would seem to have mistaken its way, place, state, and company. It would be uneasy to itself and all about it. Christ is the Mediator of this new covenant, between God and man, to bring them together in this covenant; to keep them together; to plead with God for us, and to plead with us for God; and at length to bring God and his people together in heaven. This covenant is made firm by the blood of Christ sprinkled upon our consciences, as the blood of the sacrifice was sprinkled upon the altar and the victim. This blood of Christ speaks in behalf of sinners; it pleads not for vengeance, but for mercy. See then that you refuse not his gracious call and offered salvation. See that you do not refuse Him who speaketh from heaven, with infinite tenderness and love; for how can those escape, who turn from God in unbelief or apostacy, while he so graciously beseeches them to be reconciled, and to receive his everlasting favour! God's dealing with men under the gospel, in a way of grace, assures us, that he will deal with the despisers of the gospel, in a way of judgment. We cannot worship God acceptably, unless we worship him with reverence and godly fear. Only the grace of God enables us to worship God aright. God is the same just and righteous God under the gospel as under the law. The inheritance of believers is secured to them; and all things pertaining to salvation are freely given in answer to prayer. Let us seek for grace, that we may serve God with reverence and godly fear.