Acts 13:34

And as concerning that he raised him up from the dead, now no more to return to corruption, he hath spoken on this wise, I will give you the holy and sure blessings of David. Because he saith also in another Psalm, Thou wilt not give thy Holy One to see corruption.

Holy and sure blessings ... This comes from Isaiah 55:3 where "the everlasting covenant" is mentioned as one of those blessings. Thus it must be concluded that the gospel of Jesus Christ for all men is the everlasting covenant in view there.

To see corruption ... This is an abbreviated reference to Psalms 16:10:

Thou wilt not leave my soul to Sheol; Neither wilt thou suffer thy Holy One to see corruption.

This Old Testament prophecy plainly foretold the resurrection of Christ, because only a resurrection could prevent corruption of one in the grave.

Paul next mentioned the fact that, since David's body had indeed decayed, the promise, therefore, did not apply to David but to David's greater Son, Jesus Christ. The apostle Peter used this same argument on Pentecost (Acts 2:29f). Paul summarized this argument in the next two verses.