Midrasz do Rodzaju 34:13

And Simeon and Levi answered cunningly unto Hamor and Shechem his son, saying: We will do ‎unto you according to what you have said; behold our sister is in your house, and we want you ‎only to keep away from her until we send to consult our father Isaac, for we can do nothing ‎without his consent because he knoweth the ways of our father Abraham and whatsoever he ‎will say unto us we will tell you, we shall not withhold it from you. And Simeon and Levi said ‎these words unto Hamor and his son, to find a pretext and to consult as to what should be ‎done with Shechem and his city in that matter. And when Shechem and his father heard the ‎words spoken by Simeon and Levi it pleased them exceedingly, and they started on their way ‎home. And when they were gone the sons of Jacob spoke unto their father saying: Verily thou ‎knowest the judgment of death is due to these wicked men and to their city, for they have ‎transgressed the words of God which he had commanded to Noah and his sons and his seed ‎after him forever; for he hath defiled our sister Dinah, and such an outrage should never have ‎been done in our midst. And now let us deliberate and decide what has to be done, and how ‎we can find a pretext in order to kill all the inhabitants of this city. And Simeon said unto them: ‎The best advice in this matter is to request them to circumcise every male among them even ‎as we are circumcised, and if they decline to do so we shall take our daughter from them and ‎go away. And in case they consent and do so, then when they are sore, we will come over ‎them with our swords as if they were a quiet and confiding people, and we will slay every male ‎among them. And Simeon’s advice was pleasing in their eyes, and Simeon and Levi decided to ‎act upon it. And in the morning Shechem and his father, Hamor, came once more unto Jacob ‎and his sons, to speak concerning Dinah, and to hear what answer the sons of Jacob had to ‎give to their offer. And the sons of Jacob spoke unto them cunningly, saying: We told all your ‎words unto our father, Isaac, and he was pleased with your offer, but he admonished us, ‎saying: , Thus did Abraham, my father, command me according to the will of God, the Lord of ‎the whole earth,—whenever any man, not of thy own sons, desires to take one of thy ‎daughters to wife, that man and all the male persons of his people must be circumcised even ‎as we are circumcised, and then only can we give him our daughters to wife. And now we have ‎made known to thee all the words of our father, for verily we cannot do the thing thou hast ‎spoken unto us, to give our daughter to a man that is not circumcised, as we regard it a shame. ‎But in this will we consent unto you, to give you our daughter and we will take your daughters ‎for ourselves, and to dwell in your midst and be like one people as you have spoken, if you will ‎listen unto us and consent to become like unto us, and circumcise every male among you, ‎even as we are circumcised. But if you do not listen unto us, to circumcise every male among ‎you as we are circumcised according to the commandment of our Lord, then we will come to ‎you and take our daughter from you and go away. ‎