The faithful confirm here the former truth, that God had deposited his covenant with them, which could not be made void: and hence also shines forth more clearly what I have said before, that the faithful do not learn by their own understanding what sort of Being God is, but embrace the mercy which he offers in his own word. Except God then speaks, we cannot form in our own minds any idea of his grace but what is uncertain and vanishing; but when he declares that he will be merciful to us, then every doubt is removed. This is now the course which the Prophet pursues. He says, Thou wilt give truth to Jacob, mercy to Abraham, which thou hast sworn to our fathers; as though he said, "We do not presumptuously invent any thing out of our own minds, but receive what thou hast once testified to us; for thy will has been made known to us in thy word: relying then on thy favor, we are persuaded as to thy gratuitous pardon, though we are in many respects guilty before thee." We now then understand the design of the Prophet. As to the words, it is not necessary to dwell on them, for we have elsewhere explained this form of speaking. There are here two expressions by which the Prophet characterizes the covenant of God. Truth is mentioned, and mercy is mentioned. With respect to order, the mercy of God precedes; for he is not induced otherwise to adopt us than through his goodness alone: but as God of his own will has with so great kindness received us, so he is true and faithful in his covenant. If then we desire to know the character of God's covenant, by which he formerly chose the Jews, and at this day adopts us as his people, these two things must be understood, that God freely offers himself to us, and that he is constant and true, he repents not, as Paul says, as to his covenant: The gifts and calling of God, he says, are without repentance, (Romans 11:29;) and he refers to the covenant, by which God adopted the children of Abraham. He says now, Thou wilt give, that is, show in reality; for this, to give, is, as it were, to exhibit in effect or really. Thou will then give, that is, openly show, that thou hast not been in vain so kind to us and ours, in receiving them into favor. How so? Because the effect of thy goodness and truth appears to us. Thou hast then sworn to our fathers from the days of old. The faithful take for granted that God had promised to the fathers that his covenant would be perpetual; for he did not only say to Abraham, I will be thy God, but he also added, and of thy seed for ever. Since, then, the faithful knew that the covenant of God was to be perpetual and inviolable, and also knew that it was to be continued from the fathers to their children, and that it was once promulgated for this end, that the fathers might deliver it as by the hand to their children; they therefore doubted not but that it would be perpetual. How so? for thou hast sworn to our fathers; that is, they knew that God not only promised, but that having interposed an oath, by which God designed to confirm that covenant, he greatly honored it, that it might be unhesitatingly received by the chosen people. As then the faithful knew that God in a manner bound himself to them, they confidently solicited him, really to show himself to be such as he had declared he would be to his own elect.

Thou wilt perform the truth to Jacob and the mercy to Abraham - What was free mercy to Abraham, became, when God had once promised it, His truth. Abraham also stands for all those, who in him and his Seed should be blessed, those who were "aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world" Ephesians 2:12, in no covenant or relation with God, as well as those who were the children of the faith; pagan, as well as Jews. Jacob represents these who were immediately his children, such of the children of Israel, as were also the true Israel and children of faithful Abraham. In both ways the gift to Abraham was mercy, to Jacob, truth. So also Paul saith, "Jesus Christ was a Minister of the circumcision for the truth of God, to confirm the promises made to the fathers, and that the Gentiles might glorify God for His mercy." Romans 15:8-9 yet mercy and truth Psalm 25:10, together, are all the paths of the Lord; they "met together" Psalm 85:10 in Christ; yea Christ Himself is full of Mercy as well as "Truth" John 1:14 : and woe were it to that soul to whom He were Truth without mercy. Rup.: "For to be saved, we look not so much to the truth of the Judge as to the mercy of the Redeemer." And mercy, in the counsel of God, reacheth wider than truth; for truth is given to Jacob, the father of one nation, Israel; but mercy to Abraham, "the father of many nations" Genesis 17:5; Romans 4:17. Isaac, it may be, is not here mentioned, because all to whom the blessing should come are already spoken of in Jacob and Abraham; in Jacob, all to whom the promise was first made; in Abraham, all nations of the world who should be blessed in his Seed, through the mercy of God overflowing the bounds of that covenant. Isaac is, in his sacrifice, chiefly a type of our Lord Himself.
Which Thou hast sworn unto our fathers - "That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation" Hebrews 6:18.
From the days of old - Alb.: From eternity, in the counsel of God; in promise, from the foundation of the world, as is said in the hymn of Zacharias, "As He spake by the mouth of His holy prophets, which have been since the world began" Luke 1:70. Pococke: The inspired hymns of the Blessed Virgin Mary and of Zachariah take up the words of the prophet, and shew that they are already fulfilled in Christ, although they shall be more and more fulfilled unto the world's end, as Jew and Gentile are brought into His fold; "He remembering His mercy, as He spake to our fathers, to Abraham and to his seed forever" Luke 1:54-55. "To perform the mercy promised to our fathers, and to remnember His holy covenant, the oath which He sware to our father Abraham that He would grant unto us" Luke 1:72-74.
"I too," Jerome subjoins, "sealing the labor of my little work by calling upon the Lord, will say at the close of this tract, O God, who is like unto Thee? Take away the iniquity of Thy servant, pass by the sin of my decayed soul, and send not Thine anger upon me, nor rebuke me in Thy indignation; for Thou art full of pity and great are Thy mercies. Rcturn and have mercy upon me; drown mine iniquities, and cast them into the depth of the sea, that the bitterness of sin may perish in the bitter waters. Grant the truth which Thou didst promise to Thy servant Jacob, and the mercy which Thou didst pledge to Abraham Thy friend, and free my soul, as Thou didst sware to my fathers in the days of old; "As I live, saith the Lord God, I have no pleasure in the death of the wicked, but that the wicked turn from his way and live. Then shall mine enemy see and be crowned with confusion, who now saith unto me, where is now thy God?" Ezekiel 33:11. Amen, Amen, O Good Lord Jesus.

Thou wilt perform the truth to Jacob - The promises which he has made to Jacob and his posterity. Not one of them can ever fall to the ground. "And the mercy to Abraham, which thou hast sworn;" viz., that "in his Seed all the families of the earth should be blessed;" that the Messiah should come from Abraham, through his son Isaac, by Jacob and David; be a light to lighten the Gentiles, and the glory of his people Israel. And this promise, and this oath, God has most signally fulfilled by the incarnation of Christ, who was sent to bless us by turning away every one of us from his iniquities; and for this purpose he was delivered for our offenses, and rose again for our justification; and repentance and remission of sins are preached in his name to all nations. The proclamation was first made at Jerusalem; and that the prophet refers to this, is evident from the use made of these words by Zacharias, the father of John the Baptist, when, under the full afflatus of the Spirit of God, he quoted this prophecy of Micah, as fulfilled in the incarnation of Christ, Luke 1:72, Luke 1:73. The Chaldee paraphrases this last verse with spirit and propriety: "Thou wilt give the truth to Jacob his son, as thou hast promised by oath to him in Beth-el. And the mercy to Abraham and to his seed after him, as thou didst swear to him amidst the divisions. Thou wilt be mindful of us on account of the binding of Isaac, who was bound upon the altar before thee.
And thou wilt do us that good, which, from the most ancient days, thou hast promised to our fathers by an oath." Between the divisions, refers to the covenant made between God and Abraham, Genesis 15:9-11, Genesis 15:17, Genesis 15:18. Well might the prophet exult in his challenge to earth and hell. Who Is a God Like unto Thee! Hell is speechless, earth is dumb. Infidels dare not open their mouths!!! Hallelujah! מי אל כמוך mi El camocha! Jesus is the mighty God and Savior, pardoning iniquity, transgression, and sin, and saving to the uttermost all that come unto God through him. Blessed be God! Reader, lay this to heart.

Thou wilt perform the (u) truth to Jacob, [and] the mercy to Abraham, which thou hast sworn unto our fathers from the days of old.
(u) The Church is assured that God will perform the truth of his merciful promise, which he had made long ago to Abraham, and to all that would apprehend the promise by faith.

Thou wilt perform the truth to Jacob,.... That is, the promise made to Jacob, the Lord would faithfully perform and make good to his posterity, natural and spiritual, especially to those who are Israelites indeed;
and the mercy to Abraham; the gracious promises made to him, which sprung from mere grace and mercy; all respecting his natural and spiritual seed; and especially the promise of the coming of the Messiah, that seed of his in which all nations of the earth were to be blessed; and which is the eminent instance of the mercy and grace of God to Jews and Gentiles, that walk in the steps of Abraham; see Luke 1:68;
which thou hast sworn unto our fathers from the days of old; or the promises both of multiplying the seed of Abraham, and of giving them the land of Canaan, and of the Messiah springing from them, were confirmed by an oath, Genesis 22:16. The Targum is,
"thou wilt give the truth of Jacob to his sons, as thou hast sworn to him in Bethel; the goodness of Abraham to his seed after him, as thou hast sworn to him between the pieces; thou wilt remember to us the binding of Isaac, who was bound upon the altar before thee; thou wilt do with us the good things which thou hast sworn to our fathers, from the days of old;''
which Kimchi interprets of the three fathers, Abraham, Isaac, and Jacob.

perform the truth--the faithful promise.
to Jacob . . . Abraham--Thou shalt make good to their posterity the promise made to the patriarchs. God's promises are called "mercy," because they flow slowly from grace; "truth," because they will be surely performed (Luke 1:72-73; 1-Thessalonians 5:24).
sworn unto our fathers-- (Psalm 105:9-10). The promise to Abraham is in Genesis 12:2; to Isaac, in Genesis 26:24; to Jacob, in Genesis 28:13. This unchangeable promise implied an engagement that the seed of the patriarchs should never perish, and should be restored to their inheritance as often as they turned wholly to God (Deuteronomy 30:1-2).