2Sa 2 Samuel, chapter Second Book of Samuel, chapter 8
And he struck Moav, and measured them with a chevel (cord, rope), casting them down to the ground; even with two chavalim (ropes, cords) measured he to put to death, and with one full chevel (cord) to keep alive. And so Moav became to Dovid as avadim, and brought minchah (gifts, tribute).Num 22:3; 1Ch 18:2; Deu 2:9