1 Samuel 13:16-20

And Saul, and Jonathan his son, and the people that were present with them, abode in Gibeah of Benjamin: but the Philistines encamped in Michmash.

And the spoilers came out of the camp of the Philistines in three companies: one company turned unto the way that leadeth to Ophrah, unto the land of Shual:

And another company turned the way to Beth-horon: and another company turned to the way of the border that looketh to the valley of Zeboim toward the wilderness.

Now there was no smith found throughout all the land of Israel: for the Philistines said, Lest the Hebrews make them swords or spears:

But all the Israelites went down to the Philistines, to sharpen every man his share, and his coulter, and his axe, and his mattock.