Deuteronomy 10:16 Deut. 10:16
Circumcise therefore the foreskin of your heart, and be no more stiffnecked.
Jeremiah 4:4 Jer. 4:4
Circumcise yourselves to the LORD, and take away the foreskins of your heart, ye men of Judah and inhabitants of Jerusalem: lest my fury come forth like fire, and burn that none can quench it, because of the evil of your doings.
(Relation)