Albert Barnes Commentary 1 Kings 22:3

"And the king of Israel said unto his servants, Know ye that Ramoth-gilead is ours, and we are still, and take it not out of the hand of the king of Syria?" — 1 Kings 22:3 (ASV)

According to the terms of Ahab’s covenant with Ben-hadad, Ramoth in Gilead should have been restored long before now (1 Kings 20:34). Therefore, the claim “is ours” means, “it belongs to us by right, even though the Syrians still possess it.”