1 Chronicles 18:12

Edomites. In Samuel this verse reads: “David gat him a name when he returned from smiting of the Syrians in the valley of salt, being eighteen thousand men” (2 Samuel 8:13). The probabilities are that while David was engaged in the north against the Syrians, Edom took advantage of the situation and invaded Judah, whereupon a column was sent against Edom under Abishai, who slew 18,000 of the Edomites (see on 2 Samuel 8:12). According to both Samuel and Chronicles this incident took place in the “valley of salt.” A valley so named was located in Edom (2 Kings 14:7; 2 Chronicles 25:11).