The enduring legacy of the Davidic dynasty rests on a powerful guarantee. God's promise to maintain this royal line is a direct continuation of the original covenant He made with King David. However, this eternal backing is not given unconditionally. Fulfilling the promise depends entirely on a clear requirement: the king and his descendants must faithfully observe the laws of God [מלבי״ם].
If the royal family successfully meets this standard, God will uphold His divine commitment. The royal chain of David's descendants will remain intact, ensuring that their leadership will never be broken [ביאור שטיינזלץ].