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 Psalms 25:10, together, are all the paths of the Lord; they “met together” Psalms 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.