Asa makes a treaty with the king of Syria
Asa sent gifts to the king of Syria to persuade him to attack Israel. He did, and conquered several northern cities.
Key passages
1 Ki 15:16–22

There was war between Asa and Baasha king of Israel all of their days. Baasha king of Israel went up against Judah, and he built Ramah to hinder the coming and going of anyone to Asa king of Judah. Asa took all of the silver and gold remaining in the storerooms of the house of Yahweh …

2 Ch 16:1–6

In the thirty-sixth year of the reign of Asa, Baasha the king of Israel went up against Judah. And he built Ramah in order not to allow anyone to go out or come in to Asa, king of Judah. Then Asa brought out silver and gold from the storehouses of the house of Yahweh and …

See also
Je 41:9;