Adam Clarke on 1 Kings 15:19

There is a league between me and thee - Or, Let there be a league between me and thee; as there was between my father and thy father. There was no reason why Asa should have emptied his treasures at this time to procure the aid of the Syrian king; as it does not appear that there was any danger which himself could not have turned aside. He probably wished to destroy the kingdom of Israel; and to effect this purpose, even robbed the house of the Lord.