Genesis 34:19 (KJV)

And they said unto them, We cannot do this thing, to give our sister to one that is uncircumcised; for that were a reproach unto us:

But in this will we consent unto you: If ye will be as we be, that every male of you be circumcised;

Then will we give our daughters unto you, and we will take your daughters to us, and we will dwell with you, and we will become one people.

But if ye will not hearken unto us, to be circumcised; then will we take our daughter, and we will be gone.

And their words pleased Hamor, and Shechem Hamor's son.

And Hamor and Shechem his son came unto the gate of their city, and communed with the men of their city, saying,

These men are peaceable with us; therefore let them dwell in the land, and trade therein; for the land, behold, it is large enough for them; let us take their daughters to us for wives, and let us give them our daughters.

Only herein will the men consent unto us for to dwell with us, to be one people, if every male among us be circumcised, as they are circumcised.

Shall not their cattle and their substance and every beast of their's be our's? only let us consent unto them, and they will dwell with us.

And unto Hamor and unto Shechem his son hearkened all that went out of the gate of his city; and every male was circumcised, all that went out of the gate of his city.