'Whet' in the Bible

You shall teach them diligently to your children [impressing God’s precepts on their minds and penetrating their hearts with His truths] and shall speak of them when you sit in your house and when you walk on the road and when you lie down and when you get up.

If I sharpen the lightning of My sword,And My hand takes hold of judgment,I will render vengeance on My adversaries,And I will repay those who hate Me.

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

Who have sharpened their tongues like a sword.They aim venomous words as arrows,

If the axe is dull and he does not sharpen its edge, then he must exert more strength; but wisdom [to sharpen the axe] helps him succeed [with less effort].