1 Samuel 13:20

Israeli Authorized Version

But all the Yisraelites went down to the Plishtim, 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 mine hand take hold on judgment; I will render vengeance to mine enemies, and will reward them that hate me.

Now there was no smith found throughout all the land of Yisrael: for the Plishtim 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 sharpen the goads.

And so did he in the cities of Mnasheh, and Efrayim, and Shimon, even unto Naftali, with their mattocks round about.

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