Jamieson, Fausset and Brown on Amos 1:4

4. Hazael ... Ben-hadad--A black marble obelisk found in the central palace of Nimroud, and now in the British Museum, is inscribed with the names of Hazael and Ben-hadad of Syria, as well as Jehu of Israel, mentioned as tributaries of "Shalmanubar," king of Assyria. The kind of tribute from Jehu is mentioned: gold, pearls, precious oil, &c. [G. V. Smith]. The Ben-hadad here is the son of Hazael (2Ki 13:3), not the Ben-hadad supplanted and slain by Hazael (2Ki 8:7, 15). The phrase, "I will send a fire," that is, the flame of war (Psa 78:63), occurs also in Am 1:7, 10, 12, 14, and Am 2:2, 5; Jr 49:27; Ho 8:14.