Mattock

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

And on all hills that shall be digged with the mattock, there shall not come thither the fear of briers and thorns: but it shall be for the sending forth of oxen, and for the treading of lesser cattle.

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 Manasseh, and Ephraim, and Simeon, even unto Naphtali, with their mattocks round about.

• Iron

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