'Circumcise' in the Bible

Therefore, circumcise your heart and stop being stubborn.

Then the LORD your God will circumcise both your hearts and those of your descendants so that you can love him with your heart and with your soul and therefore live.

At that time the LORD told Joshua, "Make for yourselves some flint knives and circumcise the Israelis who haven't been circumcised yet."

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."