Out of heaven he made thee to hear his voice, that he might instruct thee,.... Thunder is the voice of God, and by which he instructs men in the greatness of his power, Job 26:14, &c. unless his voice in giving the law, which was for the instruction of Israel, is meant; for that was heard on earth, on Mount Sinai, to which the following refers:

and upon earth he showed thee his great fire; on Mount Sinai, which burned with it:

and thou heardest his words out of the midst of the fire; the ten commands, and therefore may well be called, a fiery law; see Deuteronomy 4:12.

But the Lord had spoken to Israel chiefly down from heaven (cf. Exodus 20:19 [22]), and that out of the great fire, in which He had come down upon Sinai, to chastise it. יסּר does not mean "to instruct the people with regard to His truth and sovereignty," as Schultz thinks, but "to take them under holy discipline" (Knobel), to inspire them with a salutary fear of the holiness of His ways and of His judgments by the awful phenomena which accompanied His descent, and shadowed forth the sublime and holy majesty of His nature.

Out of heaven he made thee to hear his voice, that he might instruct thee: and upon earth he showed thee his great fire; and thou heardest his words out of the midst of the fire.

4:24-40 Moses urged the greatness, glory, and goodness of God. Did we consider what a God he is with whom we have to do, we should surely make conscience of our duty to him, and not dare to sin against him. Shall we forsake a merciful God, who will never forsake us, if we are faithful unto him? Whither can we go? Let us be held to our duty by the bonds of love, and prevailed with by the mercies of God to cleave to him. Moses urged God's authority over them, and their obligations to him. In keeping God's commandments they would act wisely for themselves. The fear of the Lord, that is wisdom. Those who enjoy the benefit of Divine light and laws, ought to support their character for wisdom and honour, that God may be glorified thereby. Those who call upon God, shall certainly find him within call, ready to give an answer of peace to every prayer of faith. All these statutes and judgments of the Divine law are just and righteous, above the statutes and judgments of any of the nations. What they saw at mount Sinai, gave an earnest of the day of judgment, in which the Lord Jesus shall be revealed in flaming fire. They must also remember what they heard at mount Sinai. God manifests himself in the works of the creation, without speech or language, yet their voice is heard, Ps 19:1,3; but to Israel he made himself known by speech and language, condescending to their weakness. The rise of this nation was quite different from the origin of all other nations. See the reasons of free grace; we are not beloved for our own sakes, but for Christ's sake. Moses urged the certain benefit and advantage of obedience. This argument he had begun with, ver. 1, That ye may live, and go in and possess the land; and this he concludes with, ver. 40, That it may go well with thee, and with thy children after thee. He reminds them that their prosperity would depend upon their piety. Apostacy from God would undoubtedly be the ruin of their nation. He foresees their revolt from God to idols. Those, and those only, shall find God to their comfort, who seek him with all their heart. Afflictions engage and quicken us to seek God; and, by the grace of God working with them, many are thus brought back to their right mind. When these things are come upon thee, turn to the Lord thy God, for thou seest what comes of turning from him. Let all the arguments be laid together, and then say, if religion has not reason on its side. None cast off the government of their God, but those who first abandon the understanding of a man.