God's decision to tear the kingship away from Saul marks a dramatic turning point in the history of Israel. It seals the fate of the nation's first royal dynasty and triggers a profound crisis for the prophet who originally crowned him.
The divine decree involves a profound expression of regret, representing a complete reversal of thought regarding the decision to make Saul king [רש״י, מצודת ציון, ביאור שטיינזלץ]. This reconsideration is absolute. According to [מלבי״ם], when God experiences such regret, it means the original action is entirely nullified as if it never occurred, resulting in a final judgment that leaves no room for repentance. Offering a broader historical perspective, [אהבת יהונתן] explains that the kingship was always destined for David at a specific point in time. Because the people hastily demanded a leader, Saul was appointed only as a temporary measure, despite not being fully worthy. Consequently, the moment he committed a single offense, the crown was taken from him so it could proceed to its true, original destination.
The justification for this severe dismissal is rooted in Saul's abandonment of God's path. While [מצודת דוד] views the explanation of his failure as a repeated emphasis of his straying, other commentators divide the sin into two distinct layers: a flaw in faith and a practical failure. The internal flaw represents a turning away from God in thought and belief. [מלבי״ם] views this as a profound lack of faith in God's word, noting that such a sin of heresy is far more severe than a sin driven by physical desire. Furthermore, [חומת אנך] explains that Saul strayed by ignoring a heavenly warning against being overly righteous. Instead, he relied on his own human logic, attempting to draw a moral conclusion from the laws of the broken-necked heifer in order to spare the people. Adding to this, [אהבת יהונתן] points out that truly following God requires adopting His traits. When Saul was commanded to act harshly against the wicked, just as God does, he incorrectly chose mercy, thereby actively deviating from the Creator's nature. Beyond this internal failure, the second layer of the sin was purely practical. Saul simply failed to physically execute the explicit command delivered to him by the prophet [מלבי״ם, חומת אנך].
The news of this harsh decree was devastating to the prophet. The pain he felt was that of a deeply worried man, angry and distressed over the situation [מצודת דוד, ביאור שטיינזלץ]. Driven by this intense grief, he spent the entire night crying out to God, dedicating the dark hours to weeping, arguing, and pleading for Saul's fate [מצודת דוד, ביאור שטיינזלץ].