Genesis 34:2, 24-25

Now Hamor, the tribal chief of the Hivites, had a son named Shechem, who was the prince. When he saw how attractive Dinah was, he seized her and sexually assaulted her.

So all the townsmen agreed with Hamor and his son Shechem, and every male of the city was circumcised. Three days later, while all the men were still suffering in pain, two of Jacob’s sons, Simeon and Levi, Dinah’s brothers, took their swords and attacked the unsuspecting city. They slaughtered every male of the city.