A profound moment of realization washes over Saul as he grasps the true character and destiny of the man he has been hunting. The discovery that his life was spared, marked by the severed corner of his robe, forces a complete shift in perspective. He recognizes that the man standing before him is not a threat to be eliminated, but the rightful future king. This physical proof triggers a deep memory for Saul. He recalls an earlier prophetic sign given by Samuel the Prophet, which foretold that whoever tore the corner of his robe would eventually take his place on the throne. With this realization, Saul accepts that the royal line will not continue through his own children but will transition to his former target [אברבנאל].
Saul poses a rhetorical question, asking if it is natural for someone to find a vulnerable opponent and simply allow them to walk away unharmed. The obvious answer is no. This extraordinary restraint proves completely that there is no hostility between them [מצודת דוד, ביאור שטיינזלץ]. Such an unnatural act of mercy carries an unspoken assumption. Anyone who displays this level of extraordinary kindness deserves divine compensation [רד"ק, רלב"ג]. Recognizing this, Saul offers a blessing that God should reward this benevolent act, ensuring that such a profound display of mercy does not go uncompensated [מצודת דוד].
The promised reward extends far beyond a single moment in time. This act of mercy establishes a lasting moral standard. By choosing peace over violence, a new precedent is set for all future generations. From this point forward, whenever someone encounters an opponent and chooses the path of mercy, the original peacemaker will receive additional merit for being the first to teach such righteousness. The blessing for this specific day acknowledges that on this occasion, a timeless example of kindness was established for all humanity [מלבי"ם].