'Edge' in the Bible

‘Thus says the Lord, the God of Israel, “Behold, I will turn back and dull the edge of the weapons of war that are in your hands, [those] with which you fight against the king of Babylon and the Chaldeans who are besieging you outside the walls; and I will bring them into the center of this city (Jerusalem).

And afterward, saith the LORD, I will deliver Zedekiah king of Judah, and his servants, and the people, and such as are left in this city from the pestilence, from the sword, and from the famine, into the hand of Nebuchadrezzar king of Babylon, and into the hand of their enemies, and into the hand of those that seek their life: and he shall smite them with the edge of the sword; he shall not spare them, neither have pity, nor have mercy.

In those days they shall say no more, The fathers have eaten a sour grape, and the children's teeth are set on edge.

But every one shall die for his own iniquity: every man that eateth the sour grape, his teeth shall be set on edge.