'Foreskin' in the Bible

Circumcise yourselves to the Lord;remove the foreskin of your hearts,men of Judah and residents of Jerusalem.Otherwise, My wrath will break out like fireand burn with no one to extinguish itbecause of your evil deeds.

Lo, days are coming -- an affirmation of Jehovah, And I have laid a charge on all circumcised in the foreskin,