2 Kings 3:4-7

4Mesha the king of Moab was a sheep breeder, and he used to pay [an annual tribute] to the king of Israel 100,000 lambs and the wool of 100,000 rams.

5But when Ahab died, the king of Moab rebelled against the king of Israel.

6So King Jehoram left Samaria at that time and assembled all [the fighting men of] Israel.

7Then he went and sent word to Jehoshaphat king of Judah, saying, “The king of Moab has rebelled against me. Will you go with me to fight against Moab?” And he replied, “I will go; I am as you are, my people as your people, my horses as your horses.”