It was Ahab’s house that was asking for peace, but they were asking for physical peace, not God’s peace. God does not like the world’s definition of peace, which is, “Leave me alone! I enjoy my miserable life.” When someone is at war with God and they are about to see God’s sword coming down on them, they will ask for “peace.” But in this account, they were lying.
There are many strange details in 2nd Kings 3, but the backstory is a rebellion of the ancient kingdom of Moab that roped in the northern and southern kingdoms of Israel and Edom to the southeast.
This chapter helps illustrate apostle Paul’s teaching that the “wages of sin is death” (Rom. 6:23). In this case, the wages of Moab’s rebellion was death.
2nd Kings 1 is all about rebellion, the rebellion of Moab against Israelite rule after Ahab’s death as well as Ahab’s son’s rebellion against God and the consequences of that rebellion that flowed through Israel’s army. Eliyahu showed both Ahaziah and his army that God (and God’s servants) deserved respect.