'Circumcision' in the Bible

Just as ritual circumcision cuts away the foreskin as an external symbol of dedicated covenant commitment, you must genuinely dedicate yourselves to the Lord and get rid of everything that hinders your commitment to me, people of Judah and inhabitants of Jerusalem. If you do not, my anger will blaze up like a flaming fire against you that no one will be able to extinguish. That will happen because of the evil you have done."

See, the day is coming, says the Lord, when I will send punishment on all those who have circumcision in the flesh;

On Egypt and on Judah and on Edom and on the children of Ammon and on Moab and on all who have the ends of their hair cut, who are living in the waste land: for all these nations and all the people of Israel are without circumcision in their hearts.