'Sharpen' in the Bible

If I sharpen My flashing sword,And My hand takes hold on justice,I will render vengeance on My adversaries,And I will repay those who hate Me.

So all Israel went down to the Philistines, each to sharpen his plowshare, his mattock, his axe, and his hoe.

If a man does not repent, He will sharpen His sword;He has bent His bow and made it ready.

They sharpen their tongues as a serpent;Poison of a viper is under their lips. Selah.

If the axe is dull and he does not sharpen its edge, then he must exert more strength. Wisdom has the advantage of giving success.

Sharpen the arrows, fill the quivers!The Lord has aroused the spirit of the kings of the Medes,Because His purpose is against Babylon to destroy it;For it is the vengeance of the Lord, vengeance for His temple.