'Foreskin' in the Bible

And ye shall be circumcised in the flesh of your foreskin; and it shall be a token of a covenant betwixt me and you.

And the uncircumcised male who is not circumcised in the flesh of his foreskin, that soul shall be cut off from his people; he hath broken my covenant.

And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham's house, and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.

And Abraham was ninety years old and nine, when he was circumcised in the flesh of his foreskin.

And Ishmael his son was thirteen years old, when he was circumcised in the flesh of his foreskin.

Then Zipporah took a flint, and cut off the foreskin of her son, and cast it at his feet; and she said, Surely a bridegroom of blood art thou to me.

And in the eighth day the flesh of his foreskin shall be circumcised.

Circumcise therefore the foreskin of your heart, and be no more stiffnecked.