1 Samuel 13:19-21

19Now no blacksmith (metal-worker) could be found in all the land of Israel, for the Philistines said, “Otherwise the Hebrews will make swords or spears.”

20So all [the men of] Israel went down to the Philistines, each to get his plowshare, pick, axe, or sickle sharpened.

21The fee [for sharpening] was a pim (two-thirds of a shekel) for the plowshares, the picks, the pitchforks, and the axes, and to straighten the goads (cattle prods).