'Edge' in the Bible

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

And they departed from Succoth, and pitched in Etham, which is in the edge of the wilderness.

And they removed from Kadesh, and pitched in mount Hor, in the edge of the land of Edom.