1 Chronicles 18:12 -

Abishai… slew of the Edomites . The parallel place omits to say that it was by aid of Abishai that David slew these eighteen thousand Edomites. They are there called Syrians, which reading is at all events in keeping with the Aram of the previous verse. Abishai, here named son of Zeruiah, possibly served under "Joab son of Zeruiah" ( 1 Chronicles 18:15 ), who is spoken of ( 1 Kings 11:15 , 1 Kings 11:16 ) as very trenchant in this Edomite war, without any mention being made of Abishai. Psalms 60:1-12 . (title) probably speaks of an instalment of the eighteen thousand spoken of here, as the nation now suffered all but extermination. The valley of salt . Situate in Edom ( 1 Kings 11:14-17 ; 2 Kings 14:7 ; 2 Chronicles 25:11 ). The word here used for "valley" is גֵּיא ( Psalms 23:4 ), not the more generic word עֵמֶק , and signifies rather "ravine." The phrase occurs twice with the article expressed, גֵיא חַמֶּלָח . The place is celebrated also for the achievements of Amaziah (in references just given), who proceeded hence with ten thousand prisoners, to precipitate them down the cliff , i.e. Petra ( הַסֶּלַע , 2 Chronicles 25:12 ). The real situation of this place is still doubtful. Since the time of the German traveller Geethen ('Reisen,' 2:356), and of Robinson ('Bibl. Res.,' 2:109), it has been generally assumed to be a tract of land extending some six miles south of the Dead Sea, and bounded at that distance by the range of hills which there runs across the country; but beside the consideration that the word "ravine" could not describe that tract of country, there are others very unfavourable to the supposition.