'Edge' in the Bible

And Israel smote him with the edge of the sword, and possessed his land from the Arnon unto the Jabbok, even unto the children of Ammon; for the border of the children of Ammon was strong.

And they journeyed from Succoth, and encamped in Etham, which is in the edge of the wilderness.

And they journeyed from Kadesh, and encamped in mount Hor, in the edge of the land of Edom.