'Sharpeneth' in the Bible

'And against all the sons of Israel a dog sharpeneth not its tongue, from man even unto beast, so that ye know that Jehovah doth make a separation between the Egyptians and Israel;

He teareth me in his wrath, who hateth me: he gnasheth upon me with his teeth; mine enemy sharpeneth his eyes upon me.

If one turn not, His sword he sharpeneth, His bow he hath trodden -- He prepareth it,

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