From now on when a baby boy is eight days old, you will circumcise him. This includes any boy born among your people or any who is your slave, who is not one of your descendants.
Then Abraham gathered Ishmael, all the males born in his camp, and the slaves he had bought. So that day Abraham circumcised every man and boy in his camp as God had told him to do.
You must do the same with your bulls and your sheep. Let the firstborn males stay with their mothers for seven days, and on the eighth day you must give them to me.
God made an agreement with Abraham, the sign of which was circumcision. And so when Abraham had his son Isaac, Abraham circumcised him when he was eight days old. Isaac also circumcised his son Jacob, and Jacob did the same for his sons, the twelve ancestors of our people.
They can do this because a person is not a true Jew if he is only a Jew in his physical body; true circumcision is not only on the outside of the body.
I was circumcised eight days after my birth. I am from the people of Israel and the tribe of Benjamin. I am a Hebrew, and my parents were Hebrews. I had a strict view of the law, which is why I became a Pharisee.