דברי הימים ב, פרק י״ח, פסוק ג׳

Ahab, the king of Israel, proposes a joint military campaign to Jehoshaphat, the king of Judah, and receives a response of absolute solidarity. Ahab extends an invitation to Jehoshaphat to join him in a war at Ramoth-gilead [ביאור שטיינזלץ]. Jehoshaphat answers with a deep commitment on both a personal and military level. He declares that he will act exactly as Ahab acts; just as Ahab goes out to fight, he will do the same [מצודת דוד, ביאור שטיינזלץ].

This pledge extends beyond the kings themselves to their armies. Jehoshaphat promises that his soldiers will join the war effort, fighting alongside the Israelite army with full cooperation and a completely willing heart [מצודת דוד, ביאור שטיינזלץ]. This firm commitment to the war clarifies a parallel detail found in the Book of Kings, which mentions their horses being united. It highlights the practical and complete dedication to face this military campaign together [מלבי״ם].