1 Samuel 13:21-22

Yet they had a file for the mattocks, and for the coulters, and for the forks, and for the axes, and to sharpen the goads. {a file: Heb. a file with mouths, or Heb. a pim, a third of a shekel} {sharpen: Heb. set} So it came to pass in the day of battle, that there was neither sword nor spear found in the hand of any of the people that {were} with Saul and Jonathan: but with Saul and with Jonathan his son was there found.