1 Samuel 13:20

American Standard Version (1901)

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

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If I whet my glittering sword, And my hand take hold on judgment; I will render vengeance to mine adversaries, And will recompense them that hate me.

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

yet they had a file for the mattocks, and for the coulters, and for the forks, and for the axes, and to set the goads.

And so did he in the cities of Manasseh and Ephraim and Simeon, even unto Naphtali, in their ruins round about.

Iron sharpeneth iron; So a man sharpeneth the countenance of his friend.