Acts 13:34

“"And as concerning that He raised Him up from the dead, now no more to return to corruption, He said on this wise, I will give you the sure mercies of David." "The faithful mercies," the abiding mercies, those which never perish. Paul loved them exceedingly. And observe, he does not enlarge on the ingratitude of the fathers, but puts before them what they must fear. For Stephen indeed with good reason does this, seeing he was about to be put to death, not teaching them; and showing them, that the Law is even now on the point of being abolished: but not so Paul; he does but threaten and put them in fear. And he does not dwell long on these, as taking it for granted that the word is of course believed; nor enlarge upon the greatness of their punishment, and assail that which they affectionately love, by showing the Law about to be cast out: but dwells upon that which is for their good, telling them that great shall be the blessings for them being obedient, and great the evils being disobedient.”

“But he whom God raised again,.... The Vulgate Latin version adds, "from the dead"; meaning the Lord Jesus Christ, who was raised from the dead by God the Father: and saw no corruption; he did not lie so long in the grave as to corrupt and putrefy, but was raised from the dead the third day; wherefore the passage, before cited, is very applicable to him, and is a clear proof that the Messiah was to rise from the dead, as Jesus did.”

“No more to return to corruption - To the grave, to death, the place and state of corruption; for so we should understand the word διαφθοραν in the text. The sure mercies of David - Τα ὁσια Δαβιδ τα πιϚα. These words are quoted literatim from the Septuagint version of Isa 55:3; where the Hebrew is חסדי דוד הנאמנים chasdey David ha-neemanim, of which the Greek is a faithful translation; and which sure mercies of David St. Paul considers as being fulfilled in the resurrection of Christ. From this application of the words, it is evident that the apostle considered the word David as signifying the Messiah; and then the sure or faithful mercies, being such as relate to the new covenant, and the various blessings promised in it, are evidently those which are sealed and confirmed to mankind by the resurrection of Christ; and it is in this way that the apostle applies them. Had there not been the fullest proof of the resurrection of Christ, not one of the promises of the new covenant could have been considered as sure or faithful. If he did not rise from the dead, then, as said the apostle, your faith and our preaching are vain, Co1 15:14. The following observations of Bp. Pearce are judicious: "For the sense of these words, we must have recourse to what God said to David in Sa2 7:11, Sa2 7:12, etc., explained by what is said in Psa 89:3, Psa 89:4, Psa 89:28, Psa 89:29, Psa 89:36, where frequent mention is made of a covenant established by God with David, and sworn to by God, that David's seed should endure for ever, and his throne as the days of heaven, and as the sun, to all generations. This covenant and this oath are the sure and sacred things of which Isaiah, Isa 55:3, speaks; and Luke in this place. And Paul understood them as relating to the kingdom of Jesus, (the Son of David), which was to be an everlasting kingdom; and if an everlasting one, then it was necessary that Jesus should have been (as he was) raised from the dead; and, to support this argument, Paul, in the next verse, strengthens it with another, drawn from Psa 16:10."”

“now no more to return to corruption--that is, to the grave where death reigns; and compare Rom 6:9, "Christ being raised from the dead dieth no more, death hath no more dominion over him." I will give you the sure mercies of David-- (Isa 55:3). The word rendered "mercies" is peculiar, denoting the sanctity of them, as comprehending the whole riches of the new covenant; while the other word, "sure," points to the certainty with which they would, through David's Seed, be at length all substantiated. See on Joh 1:14. But how do these words prove the resurrection of Christ? "They presuppose it; for since an eternal kingdom was promised to David, the Ruler of this kingdom could not remain under the power of death. But to strengthen the indefinite prediction by one more definite, the apostle adduces Psa 16:10, of which Peter had given the same explanation (see on Act 2:27; Act 2:30-31), both apostles denying the possibility of its proper reference to David" [OLSHAUSEN].”