'Circumcision' in the Bible

Undergo a circumcision of the heart, you men of Judah and people of Jerusalem: or my wrath may come out like fire, burning so that no one is able to put it out, because of the evil of your doings.

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.