עזרא ד:א פירוש: רש״י

the adversaries of Judah and Benjamin They are the nations whom Sannecherib settled in the land Israel, as it says (II Kings 17:24): “And the king of Assyria brought [people] from Babylonia and from Cuthah and from Avvah and from Hamath and from Sepharvaim, and he settled them in the cities of Samaria instead of the Children of Israel.”