מלכים ב, פרק ט׳, פסוק ט״ז

The outbreak of a royal rebellion requires swift, calculated action and the perfect window of opportunity. Taking advantage of careful planning, Jehu gathers a portion of his men and sets off for Jezreel to launch his revolt [ביאור שטיינזלץ]. He moves immediately and in complete secrecy, ensuring his actions are carried out before the public can discover his intentions [אברבנאל].

Jezreel is the chosen destination because Jehu knows exactly who is staying there. Both Joram and Ahaziah are present, presenting an ideal chance to eliminate them easily. At this specific time, the two kings are cut off from the general population and their military forces, leaving them highly vulnerable [מלבי״ם]. The presence of Ahaziah, the king of Judah, is simply a result of family ties and an existing alliance. As Joram's nephew, Ahaziah traveled to Jezreel exclusively to visit his sick uncle. His stay is entirely personal and completely free of any political motives [ביאור שטיינזלץ].