Genesis 34:5
Jacob heard that Shechem had defiled his daughter Dinah, but since his sons were with his livestock in the field, he held his peace until they returned.

Genesis 34:7
When Jacob's sons heard what had happened, they returned from the field. They were filled with grief and fury, because Shechem had committed an outrage in Israel by lying with Jacob's daughter--a thing that should not be done.