שמואל ב, פרק ג׳, פסוק י״ח

The momentum to officially crown David as king builds upon a powerful combination of established family ties and an explicit divine mandate. Because David is married to Saul's daughter, he is already considered an integral part of the previous royal household. Recognizing this connection, the speaker encourages the people to act on their original desires to establish David's reign, openly declaring his own preference for David over any other potential candidate from Saul's lineage [מצודת דוד, ביאור שטיינזלץ].

Beyond political and familial connections, the transition of power is firmly rooted in a promise from God. When God conveyed His plan, it functioned simultaneously as a declaration about David to the nation and as a direct communication to the future king himself [רש״י]. At the very heart of this divine guarantee is a commitment to national salvation. God expressed a clear intention to rescue Israel through David's leadership. This promise is interpreted either as a direct, personal pledge from God stating that He will personally save the people [מצודת ציון, מנחת שי בשם רבנו ישעיה], or as a broader decree to bring about their salvation through David's hands [רד״ק, מנחת שי]. Regardless of the nuance, the ultimate meaning remains identical: Israel's deliverance is assured through David's designated rule.