For I testify about them that they have a zeal for God, but not according to knowledge.
As if the apostle had said, "I can bear them witness that many, very many, of the Jews, have a zealous desire in their way to please God, and do what is acceptable in his sight; but though it be a warm, it is but a blind zeal, and not according to right knowledge." Here observe, 1.
Paul's heart's desire and prayer for the Jews was their salvation, not a formal wish, but a real breathing out of the soul before God. Though he preached against their error, he prayed for them with strength and sincerity, as God Himself wills that none should perish.
AI summary
Commenting on Romans 10:1-11
For I bear them record, that they have a zeal of God,.... A zeal for God; for the being and unity of God, against the polytheism and idolatry of the Gentiles; for the word of God, the writings of the Old Testament, of which they were zealous defenders and preservers, and which they diligently read and heard explained, and whereby they thought to obtain eternal...