What is the meaning of "va'Asher Dimah Lanu Nishmadnu me'Hisyatzev b'Chol Gevul Yisrael"?
1.
Rashi: He thought in his heart that through him, we are eradicated from standing in Eretz Yisrael.
2.
Malbim: Through his decree and intent, we are banished from all cities. We are considered open prey; if we pardon, this will not be fixed, and surely Yisrael will not help us to feed ourselves. (Therefore, to fence the matter, give to us seven descendants of Sha'ul