1 Kings 22:4

4 And he said to Jehoshaphat, Whether thou shalt come with me to fight in Ramoth of Gilead? And Jehoshaphat said to the king of Israel, As I am, so and thou (I am ready when thou art/What is mine is yours); my people and thy people be one; and my knights and thy knights be one.

1 Kings 22:4 Meaning and Commentary

Ver. 4 And he said unto Jehoshaphat, wilt thou go with me to battle
to Ramothgilead?
&c.] This affair being lately canvassed at the council board, and very much on Ahab's mind, he puts this question to Jehoshaphat, his visitor, relation, and ally; wisely considering that his own forces were small, and that to have such an auxiliary might be of great advantage to him:

and Jehoshaphat said to the king of Israel, I am as thou art, my people
as thy people, my horses as thy horses;
meaning, that he and his soldiers, foot and horse, were at his service.

1 Kings 22:4 In-Context

2 And in the third year Jehoshaphat, king of Judah, went down to the king of Israel.

3 And the king of Israel said to his servants, Know ye not, that Ramoth of Gilead is ours, and (that) we be negligent to (not) take it (back) from the hand of the king of Syria?

4 And he said to Jehoshaphat, Whether thou shalt come with me to fight in Ramoth of Gilead? And Jehoshaphat said to the king of Israel, As I am, so and thou (I am ready when thou art/What is mine is yours); my people and thy people be one; and my knights and thy knights be one.

5 And Jehoshaphat said to the king of Israel, I pray thee, ask thou today the word of the Lord.

6 Therefore the king of Israel gathered together [the] prophets, about four hundred men, and he said to them, Ought I to go into Ramoth of Gilead to fight, either ought I to rest? Which answered, Go thou up, and the Lord shall give it in(to) the hand of the king.