Genesis 34:14-17

And they said to them, “We cannot do this thing, to give our sister to one who is uncircumcised, for that would be a reproach to us. But on this condition we will consent to you: If you will become as we are, if every male of you is circumcised, then we will 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. But if you will not heed us and be circumcised, then we will take our daughter and be gone.”