The verse speaks of a descendant who would sit on David's throne. But which throne, and which descendant? Peter clarifies this crucial link to Jesus.
The oath God made to David was specific: 'that he would set one of his descendants on his throne.' While this initially pointed to Solomon, the promise’s true fulfillment lies in Jesus Christ.
Scholars note that key phrases in this verse, like 'according to the flesh, he would raise up Christ,' are not in the oldest manuscripts. This suggests Peter's point wasn't about the oath including Christ's resurrection, but that David, as a prophet, foresaw the Messiah.
The core of the promise is God establishing one from David's line to rule. Peter argues that David’s own writings (the Psalms) reveal he understood this promise pointed beyond his immediate family to the ultimate King—Jesus.