A magnificent picture of redemption emerges, completely reversing earlier prophecies of destruction. Where the vineyard was once threatened with the removal of its protection and the withholding of rain, it now enjoys absolute security. The primary approach among commentators is that God Himself acts as the ultimate guardian of Israel, shielding His people from external harm [מלבי״ם, מצודת דוד, מצודת ציון]. This continuous protection is seen as the resting of the Divine Presence in Zion [אבן עזרא], or as a specific promise of survival throughout the long period of exile [רש״י]. A unique perspective, however, suggests that the prophet is the one speaking, declaring that he personally guards the land of Judah through his constant rebukes and guidance [שד״ל].
The promise of constant watering carries two distinct interpretations. Most commentators view it as a pledge of endless spiritual and material abundance. In this light, God continuously nourishes His people with divine providence, wisdom, and eternal prophecy [רד״ק, מלבי״ם, מצודת דוד, אבן עזרא]. Conversely, another approach reads this continuous watering as an act of controlled judgment. Rather than overwhelming the people with punishment all at once, God administers justice drop by drop, ensuring they are never completely destroyed [רש״י].
The exact nature of what is being guarded against offers a rich tapestry of meaning. A highly poetic approach suggests that God watches over the vineyard so carefully that not a single leaf will fall or go missing. This illustrates a profound level of individual providence; every single person in Israel, from the greatest to the smallest, is counted, valued, and protected by Him [מצודת דוד, מלבי״ם, רד ק בשם אביו, אבן עזרא בשם ר' יצחק בן שאול]. Others understand the threat more literally, explaining that God shields the nation so that no external enemy can attack [רד״ק, אבן עזרא בשם ר' משה הכהן, ביאור שטיינזלץ].
Alternatively, the protection is viewed through a spiritual lens, with God guarding Israel day and night so that He will not have to punish them for their sins [רש י בשם תרגום יונתן, מנחת שי]. Some explain that while God will bring judgment upon all other nations, He will ultimately spare Israel [אבן עזרא בשם ר' יונה]. Following the view that the prophet is the speaker, the dynamic shifts entirely: the prophet tirelessly warns the people because he fears that the Owner of the vineyard, God, will come to inspect it and grow angry if it fails to yield fruit [שד״ל]. Ultimately, the promise of protection by day and by night guarantees a constant, unyielding divine presence that accompanies the people at all times [מצודת ציון].