'Foreskin' in the Bible

You are all to be circumcised in the flesh of your foreskin, and this is to be the sign of the covenant between me and you.

Any uncircumcised male who does not have the foreskin of his flesh circumcised on the eighth day after his birth is to be eliminated from his people because he has broken my covenant."

Zipporah took a flint knife, cut off her son's foreskin, and touched Moses' feet with it, saying while doing so, ""because you are a bridegroom of blood to me."

On the eighth day, the flesh of the baby's foreskin is to be circumcised.

causing me to oppose them and take them to the land of their enemies so that the uncircumcised foreskin of their hearts can be humbled and so that they accept the punishment of their iniquity

Circumcise yourselves to the LORD and remove the foreskin of your heart, you men of Judah and residents of Jerusalem, or else my wrath will break out like fire and burn with no one to put it out, because of your evil deeds."