'Sharpened' in the Bible

They have sharpened their tongues like a serpent; adders' poison is under their lips. Selah.

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.