Charles Ellicott Commentary 1 Kings 22:4

"And he said unto Jehoshaphat, Wilt thou go with me to battle to Ramoth-gilead? And Jehoshaphat said to the king of Israel, I am as thou art, my people as thy people, my horses as thy horses." — 1 Kings 22:4 (ASV)

I am as thou art. —The answer is apparently one of deference, as well as friendship, to the stronger kingdom. It must be remembered that, as the whole chapter shows, Ahab had now returned to the worship of the Lord.