C. F. Keil and Franz Delitzsch on 2 Kings 16:9

2Ki 16:9

Tiglath-pileser then marched against Damascus, took the city, slew Rezin, and led the inhabitants away to Kir, as Amos had prophesied (Amo 1:3-5). קיר, Kir, from which, according to Amo 9:7, the Aramaeans had emigrated to Syria, is no doubt a district by the river Kur (Κῦρος, Κύῤῥος), which taking its rise in Armenia, unites with the Araxes and flows into the Caspian Sea, although from the length of the river Kur it is impossible to define precisely the locality in which they were placed; and the statement of Josephus (Ant. ix. 13, 3), that the Damascenes were transported εἰς τὴν ἄνω Μηδίαν, is somewhat indefinite, and moreover has hardly been derived from early historical sources (see M. v. Niebuhr, Gesch. Assurs, p. 158). Nothing is said here concerning Tiglath-pileser’s invasion of the kingdom of Israel, because this has already been mentioned at 2Ki 15:29 in the history of Pekah.