Genesis 34:21-25

“These men are friendly to us; therefore let them live in the land and trade in it, for behold, the land is large enough for them. We will take their daughters in marriage, and give our daughters to them.

Only on this condition will the men consent to us to live with us, to become one people: that every male among us be circumcised just as they are circumcised.

Will their livestock and their property and all their animals not be ours? Let’s just consent to them, and they will live with us.”

All who went out of the gate of his city listened to Hamor and to his son Shechem, and every male was circumcised, all who went out of the gate of his city.

Now it came about on the third day, when they were in pain, that two of Jacob’s sons—Simeon and Levi, Dinah’s brothers—each took his sword and came upon the city undetected, and killed every male.