2 Samuel 8:13
13 And David made a name for himself when he returned from striking down 18,000 Edomites in athe Valley of Salt.
1 Chronicles 18:12
12 And kAbishai, the son of Zeruiah, killed 18,000 Edomites in the Valley of Salt.
Psalm 60:1
He Will Tread Down Our Foes
To the choirmaster: according to fShushan Eduth. A gMiktam1 of David; hfor instruction; when he istrove with Aram-naharaim and with Aram-zobah, and when Joab on his return struck down twelve thousand of Edom in the Valley of Salt.
1 O God, jyou have rejected us, kbroken our defenses;
you have been angry; loh, restore us.