Genesis 34
24 Ref All who went out of the gate of his city listened to Hamor, and to Shechem his son; and every male was circumcised, all who went out of the gate of his city.
25 Ref It happened on the third day, when they were sore, that two of Jacob's sons, Simeon and Levi, Dinah's brothers, each took his sword, came upon the unsuspecting city, and killed all the males.