Matthew Henry on 1 Kings 22:1-14
Though Ahab continued under guilt and wrath, and the dominion of the lusts to which he had sold himself, yet, as a reward for his professions of repentance and humiliation, though the time drew near when he should descend into battle and perish, yet we have him blessed with a three years' peace (Kg1 22:1) and an honourable visit made him by Jehoshaphat king of Judah, Kg1 22:2. The Jews have a fabulous conceit, that when Ahab humbled himself for his sin, and lay in sackcloth, he sent for Jehoshaphat to come to him, to chastise him; and that he staid with him for some time, and gave him so many stripes every day. This is a groundless tradition. He came now, it is probable, to consult him about…
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Three years without war - That is, from the time that Ahab made the covenant with Ben-hadad, mentioned Kg1 20:34. And probably in that treaty it was stipulated that Ramoth-gilead should be restored to Israel; which not being done, Ahab formed a confederacy with Judah, and determined to take it by force.
John Gill on 1 Kings 22:1
And they continued three years without war between Syria and Israel. From the time that Benhadad made a covenant with Ahab; not three full years, but part of them: it was threatened by Elijah from the Lord, that Ahab's life should go for Benhadad's, because he had let him, go, 1 Kings 22:42, but because of his humiliation, as is thought by Ben Gersom and others, it was respited for those three years; and now an opportunity and occasion would be given for the fulfilment of what was threatened.
Keil & Delitzsch on 1 Kings 22:1-40
Allied Campaign of Ahab and Jehoshaphat against the Syrians at Ramoth, and Death of Ahab (compare 2 Chron 18:2-34). - Kg1 22:1. "And they rested three years; there was no war between Aram and Israel," ישׁב here is to keep quiet, to undertake nothing, as in Jdg 5:17, etc. The subject to ויּשׁבוּ is Aram and Israel mentioned in the second clause. The length of time given here points back to the end of the war described in 1 Kings 20.
Kg1 22:2-4
In the third year (not necessarily "towards the end of it," as Thenius supposes, for Jehoshaphat's visit preceded the renewal of the war) Jehoshaphat visited the king of Israel, with whom he had already formed a marriage alliance by marrying his son to…