'Edge' in the Bible

Afterward, says Yahweh, I will deliver Zedekiah king of Judah, and his servants, and the people, even such as are left in this city from the pestilence, from the sword, and from the famine, into the hand of Nebuchadnezzar king of Babylon, and into the hand of their enemies, and into the hand of those who seek their life: and he shall strike 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 sour grapes, and the children's teeth are set on edge.

But everyone shall die for his own iniquity: every man who eats the sour grapes, his teeth shall be set on edge.