He shall say - He shall begin to expostulate with them, to awaken them to a due sense of their ingratitude and rebellion. This may refer to the preaching of the Gospel to them in the latter days.

And he shall say, where are their gods?.... Not the Lord shall say to Israel, upbraiding them with their idols and their idolatries; but, as the Targum of Jonathan,"the enemy shall say, where is the God of Israel?''and to the same purpose is, the Jerusalem Targum, and which is the sense of other Jewish writers (w); and the words may be rendered impersonally, and in the singular number, "and it shall be said, where is their God?" as it follows:

their rock in whom they trusted? that is, it shall be said to the people of God, when in the low estate before described, and which will make it still more distressing; it shall be said to them by their enemies in a sneering way, where is the Lord their God they boasted of, and the rock of salvation in whom they trusted? which agrees with other passages of Scripture, Psalm 42:3. The persons insulted and upbraided are the Protestant witnesses at the time of their being slain; when "they that dwell upon the earth", the Papists, "shall rejoice over them", Revelation 11:10; they are such who are true believers in the God and Father of Christ, as their God and Father in Christ, who of his own free grace has blessed them with all spiritual blessings in him; and who trust in Christ the rock alone for justification before God, for acceptance with him, and for their whole salvation; rejecting the Popish notion of justification by works, the doctrines of merit, and of works of supererogation, and the like; who now will be taunted at, and triumphed over, saying, where is the God of the Protestants they gloried in, as being on their side? and where is their rock on which they say the church is built, and not on Peter?

(w) Aben Ezra & R. Nehemiah in Jarchi in loc.

The Lord would then convince His people of the worthlessness of idols and the folly of idolatry, and bring it to admit the fact that He was God alone. "Then will He say, Where are their gods, the rock in whom they trusted; who consumed the fat of their burnt-offerings, the wine of their libations? Let them rise up and help you, that there may be a shelter over you! See now that I, I am it, and there is no God beside Me: I kill, and make alive; I smite in pieces, and I heal; and there is no one who delivers out of My hand." ואמר might be taken impersonally, as it has been by Luther and others, "men will say;" but as it is certainly Jehovah who is speaking in Deuteronomy 32:39, and what Jehovah says there is simply a deduction from what is addressed to the people in Deuteronomy 32:37 and Deuteronomy 32:38, there can hardly be any doubt that Jehovah is speaking in Deuteronomy 32:37, Deuteronomy 32:38, as well as in Deuteronomy 32:34, Deuteronomy 32:35, and therefore that Moses simply distinguishes himself from Jehovah in Deuteronomy 32:36, when explaining the reason for the judgment foretold by the Lord. The expression "their gods," relates, not to the heathen, but to the Israelites, upon whom the judgment had fallen. The worthlessness of their gods had become manifest, namely, of the strange gods or idols, which the Israelites had preferred to the living God (vid., cf. Deuteronomy 32:16, Deuteronomy 32:17), and to which they had brought their sacrifices and drink-offerings. In Deuteronomy 32:38, אשׁר is the subject, - the gods, who consumed the fat of the sacrifices offered to them by their worshippers (the foolish Israelites), - and is not to be taken as the relative with זבחימו, as the lxx, Vulg., and Luther have rendered it, viz., "whose sacrifices they (the Israelites) ate," which neither suits the context nor the word חלב (fat), which denotes the fat portions of the sacrificial animals that were burned upon the altar, and therefore presented to God. The wine of the drink-offerings was also poured out upon the altar, and thus given up to the deity worshipped. The handing over of the sacrificial portions to the deity is described here with holy irony, as though the gods themselves consumed the fat of the slain offerings, and drank the wine poured out for them, for the purpose of expression this thought: "The gods, whom ye entertained so well, and provided so abundantly with sacrifices, let them now arise and help you, and thus make themselves clearly known to you." The address here takes the form of a direct appeal to the idolaters themselves; and in the last clause the imperative is introduced instead of the optative, to express the thought as sharply as possible, that men need the protection of God, and are warranted in expecting it from the gods they worship: "let there be a shelter over you." Sithrah for sether, a shelter or defence.

And he shall say, Where are their gods, their rock in whom they trusted,

32:37 He shall say - The Lord, before he deliver his people, will first convince them of their former folly in forsaking him and following idols.

Margin trusted

See Scofield Note: "Ps 2:12".

32:26-38 The idolatry and rebellions of Israel deserved, and the justice of God seemed to demand, that they should be rooted out. But He spared Israel, and continues them still to be living witnesses of the truth of the Bible, and to silence unbelievers. They are preserved for wise and holy purposes and the prophecies give us some idea what those purposes are. The Lord will never disgrace the throne of his glory. It is great wisdom, and will help much to the return of sinners to God, seriously to consider their latter end, or the future state. It is here meant particularly of what God foretold by Moses, about this people in the latter days; but it may be applied generally. Oh that men would consider the happiness they will lose, and the misery they will certainly plunge into, if they go on in their trespasses! What will be in the end thereof? Jer 5:31. For the Lord will in due time bring down the enemies of the church, in displeasure against their wickedness. When sinners deem themselves most secure, they suddenly fall into destruction. And God's time to appear for the deliverance of his people, is when things are at the worst with them. But those who trust to any rock but God, will find it fail them when they most need it. The rejection of the Messiah by the Jewish nation, is the continuance of their ancient idolatry, apostacy, and rebellion. They shall be brought to humble themselves before the Lord, to repent of their sins, and to trust in their long-rejected Mediator for salvation. Then he will deliver them, and make their prosperity great.