Genesis 34:14-16
14
and said to them, "We can't do this thing, to give our sister to one who is uncircumcised; for that is a reproach to us.
15
Only on this condition will we consent to you. If you will be as we are, that every male of you be circumcised;
16
then will we give our daughters to you, and we will take your daughters to us, and we will dwell with you, and we will become one people.