Genesis 34:22

Only herein will the men consent unto us
The only term or condition insisted upon, to come into an alliance and affinity with us, and for to dwell with us, to be one people,
to become one body politic, is the following one: if every male among us be circumcised, as they [are] circumcised;
submitting to this rite, they agree to take up their residence with us, and be incorporated among us, and become one people.