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

Son of man, prophesy, and say, Thus saith the LORD; Say, A sword, a sword is sharpened, and also furbished:

It is sharpened to make a sore slaughter; it is furbished that it may glitter: should we then make mirth? it contemneth the rod of my son, as every tree.

And he hath given it to be furbished, that it may be handled: this sword is sharpened, and it is furbished, to give it into the hand of the slayer.

Their horses also are swifter than the leopards, and are more fierce than the evening wolves: and their horsemen shall spread themselves, and their horsemen shall come from far; they shall fly as the eagle that hasteth to eat.