'Circumcision' in the Bible

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.

So He let Moses alone [to recover]. At that time Zipporah said, “You are a husband of blood”—because of the circumcision.