2 Samuel 8:1-2

After this, David defeated the Philistines,  subdued them, and took Metheg-ammah  from Philistine control.  , He also defeated the Moabites, and after making them lie down on the ground, he measured them off with a cord. He measured every two cord lengths of those to be put to death and one full length of those to be kept alive. So the Moabites became David’s subjects and brought tribute.