The God of my mercy shall prevent me,.... Or "of my grace", or "goodness", as the Targum; see 1Pe 5:10. God is gracious in himself, and he has treasured up a fulness of grace in Christ: he is the donor of all the blessings of grace in the covenant; and the author of all internal grace in the hearts of his people; and who supplies them with more grace as they want it; and he is the Father of all temporal and spiritual mercies.
The "Cetib", or writing, is wdox, "his mercy"; the "Keri", or reading, is ydox, "my mercy"; grace or mercy is the Lord's; it is his own, which he disposes of as he pleases; being given and applied, it is the believer's; all the grace and mercy in the heart of God, in his Son, and in his covenant, is the saints', which he keeps for them with Christ for evermore; "the God of my mercy", or "grace", is the same with "my merciful", or "my gracious God"; who goes before his people, as he does the Messiah, with the blessings of his goodness, Ps 21:3.