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.
And as concerning that he raised him up from the dead, now no more to return to corruption - that is, to the grave, where death reigns: compare Romans 6:9, "Christ being raised from the dead, dieth no more; death hath no more dominion over him." Christ went to the place, but not the state of corruption (Acts 13:37).
He said on this wise (or 'thus') - namely in Isaiah 55:3,
I will give you the sure mercies of David, х ta (G3588) hosia (G3741) Dauid (G1138) = chacdeey (H2617) Dawiyd (H1732), ta (G3588) pista (G4103)] - literally, 'the sure sanctities of David.' The word, however, is sometimes used in the sense of "mercies" in the Old Testament. The whole riches of the everlasting covenant-its varied "grace" or "mercies" - are here meant; and they are characterized in the prophecy, first, as 'sanctities,' to signify that, as they quite transcend the sphere of things seen and temporal, so they separate to a holy character all such as receive them; but they are further characterized as "sure," to denote the certainty with which they would at length, through David's Seed, be all substantiated (see more on this subject at John 1:14, p. 349). But how do these words prove the resurrection of Christ? 'They presuppose it (as Olshausen says); 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 Psalms 16:10, of which Peter had given the same explanation (see the notes at Acts 2:27; Acts 2:30-31); both apostles denying the possibility of its proper reference to David.