'Line' in the Bible

He defeated Moab, and measured them with the line, making them lie down on the ground; and he measured two lines to put to death and one full line to keep alive. And the Moabites became servants to David, bringing tribute.

He had written in the letter, saying, “Place Uriah in the front line of the fiercest battle and withdraw from him, so that he may be struck down and die.”