3:26 To declare, [I say], {a} at this time his righteousness: that he might be {b} just, and the {c} justifier of him which {d} believeth in Jesus.
(a) That is, when Paul wrote this.
(b) That he might be found exceedingly truth and faithful.
(c) Making him just and without blame, but putting Christ's righteousness to him.
(d) Of the number of those who by faith lay hold upon Christ: contrary to whom are those who seek to be saved by circumcision, that is by the law.
3:26 That he might be just. Can God be just, and yet justify the sinner? Only, because justice was fully satisfied when the sinless Christ died, not for himself, but for his people. The believer in Christ Jesus, trusting in him, baptized into Christ, into his death, is in Christ, and Christ hath paid the penalty for all who are found in him.
3:26 For a demonstration of his righteousness - Both of his justice and mercy. That he might be just - Showing his justice on his own Son. And yet the merciful justifier of every one that believeth in Jesus. That he might be just - Might evidence himself to be strictly and inviolably righteous in the administration of his government, even while he is the merciful justifier of the sinner that believeth in Jesus. The attribute of justice must be preserved inviolate; and inviolate it is preserved, if there was a real infliction of punishment on our Saviour. On this plan all the attributes harmonize; every attribute is glorified, and not one superseded no, nor so much as clouded.
3:21-26 Must guilty man remain under wrath? Is the wound for ever incurable? No; blessed be God, there is another way laid open for us. This is the righteousness of God; righteousness of his ordaining, and providing, and accepting. It is by that faith which has Jesus Christ for its object; an anointed Saviour, so Jesus Christ signifies. Justifying faith respects Christ as a Saviour, in all his three anointed offices, as Prophet, Priest, and King; trusting in him, accepting him, and cleaving to him: in all these, Jews and Gentiles are alike welcome to God through Christ. There is no difference, his righteousness is upon all that believe; not only offered to them, but put upon them as a crown, as a robe. It is free grace, mere mercy; there is nothing in us to deserve such favours. It comes freely unto us, but Christ bought it, and paid the price. And faith has special regard to the blood of Christ, as that which made the atonement. God, in all this, declares his righteousness. It is plain that he hates sin, when nothing less than the blood of Christ would satisfy for it. And it would not agree with his justice to demand the debt, when the Surety has paid it, and he has accepted that payment in full satisfaction.