1 Samuel 13:16-23

Saul and his son Jonathan and the people with them were staying in Geba of Benjamin, while the Philistines camped at Michmash. And the raiding party came from the Philistine camp in three companies: one company turned toward Ophrah, to the land of Shual, another company turned toward Beth-horon, and another toward the border overlooking the Valley of Zeboim toward the wilderness. Now 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.” So all [the men of] Israel went down to the Philistines, each to get his plowshare, pick, axe, or sickle sharpened. The 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). So it came about on the day of battle that neither sword nor spear was found in the hands of any of the people who were with Saul and Jonathan; but Saul and Jonathan his son had them. And the garrison of the Philistines went out to the pass at Michmash.