Genesis 34:7

And the sons of Jacob came out of the field when they heard it. The bad news reached them also before the usual hour for returning from the field, and they acted with the impetuosity of youth. 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. Even in those days, when the family of Jacob was still small, the act of Shechem was considered an insult to the entire tribe. The more the sons of Jacob therefore thought about it, the higher their anger mounted. The dignity of the entire posterity of Israel had been besmirched, and they felt that they could not bear the disgrace.