2 Kings 1:1 - Joseph Benson’s Commentary on the Old and New Testaments

Then Moab rebelled against Israel Paid them no more tribute, but utterly disclaimed their authority over them. Moab had been subdued by David, as Edom was; and, upon the division of his kingdom, the former was adjoined to that of Israel, and the latter to that of Judah, each to that kingdom upon which it bordered. But when the kingdoms of Israel and Judah were weak, and forsaken by God, they took that opportunity to revolt from them: Moab here, and Edom a little after.