Genesis 34:25-26

Now on the third day [after the circumcision], when all the men were [terribly] sore and in pain, two of Jacob’s sons, Simeon and Levi, Dinah’s [full] brothers, took their swords, boldly entered the city [without anyone suspecting them of evil intent], and they killed every male. They killed Hamor and his son Shechem with the edge of the sword, and took Dinah out of Shechem’s house [where she was staying], and left.