Sforno on Genesis 34:25/ספורנו על בראשית ל״ד:כ״ה

1ויהרגו כל זכר, these men had not circumcised themselves in order to become Jews and embrace monotheism but only in order to lay their hands on the vast possessions of the family of Yaakov, as their leaders Chamor and Shechem had promised them.