Deuteronomy 32:5

“They have corrupted themselves, etc.] This and what follows may seem to be the characters of the enemies of Christ, who lightly esteemed and rejected him, set in a contrast with him; who were not only corrupt by nature, as all men are, but were men of corrupt minds in their tenets and principles; who corrupted the word of God by their traditions, in the times of Christ; and were men of corrupt practices themselves, and corrupters of others: their spot [is] not [the spot] of his children; of the children of the divine Person before described; Christ the rock has “children” given him by his Father, in whose adoption he has a concern, and by whose Spirit they are regenerated: these have their…”

“They have corrupted themselves--that is, the Israelites by their frequent lapses and their inveterate attachment to idolatry. their spot is not the spot of his children--This is an allusion to the marks which idolaters inscribe on their foreheads or their arms with paint or other substances, in various colors and forms--straight, oval, or circular, according to the favorite idol of their worship.”

“Song of Moses If Deuteronomy 32:1-3 be regarded as the introduction, and Deuteronomy 32:43 as the conclusion, the main contents of the song may be grouped under three heads, namely, (1) Deuteronomy 32:4-18, the faithfulness of God, the faithlessness of Israel; (2) Deuteronomy 32:19-33, the chastisement and the need of its infliction by God; (3) Deuteronomy 32:34-42, God’s compassion upon the low and humbled state of His people. The Song differs signally in diction and idiom from the preceding chapters; just as a lyrical passage is conceived in modes of thought wholly unlike those which belong to narrative or exhortation, and is uttered in different phraseology. There are, however, in the…”

“They - The Israelites. Their spot - The wickedness with which they are stained, is not of his children - Plainly shews they are not his children, but the devil's. God's children have no such spot. Indeed this text does not affirm, they have any spot at all. Perverse - Froward and untractable: Crooked - Irregular and disorderly. Deuteronomy 32:6”

“They have corrupted themselves: Heb. He hath corrupted to himself, Deu 4:16, Deu 31:29; Gen 6:12; Exo 32:7; Jdg 2:19; Isa 1:4; Hos 9:9; Zep 3:7; Co2 11:3 their spot: etc. or, that they are not his children, that is their blot, Joh 8:41 a perverse: Deu 9:24; Psa 78:8; Isa 1:4; Mat 3:7, Mat 16:4, Mat 17:17; Luk 9:41; Act 7:51; Phi 2:15 Deuteronomy 32:6”