Genesis 34:12 (KJV)

And the sons of Jacob came out of the field when they heard it: and the men were grieved, and they were very wroth, because he had wrought folly in Israel in lying with Jacob's daughter: which thing ought not to be done.

And Hamor communed with them, saying, The soul of my son Shechem longeth for your daughter: I pray you give her him to wife.

And make ye marriages with us, and give your daughters unto us, and take our daughters unto you.

And ye shall dwell with us: and the land shall be before you; dwell and trade ye therein, and get you possessions therein.

And Shechem said unto her father and unto her brethren, Let me find grace in your eyes, and what ye shall say unto me I will give.

And the sons of Jacob answered Shechem and Hamor his father deceitfully, and said, because he had defiled Dinah their sister:

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.