Genesis 34:14-16

They said to them, “We cannot do this thing and give our sister [in marriage] to one who is not circumcised, because that would be a disgrace to us. But we will consent to you only on this condition: if you will become like us, in that every male among you consents to be circumcised, then we will give our daughters to you [in marriage], and we will take your daughters for ourselves, and we will live with you and become one people.