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.
Circumcise yourselves to the Lord ... take away the foreskins of your heart - remove your natural corruption of heart. (Alluding to Deuteronomy 10:16, "Circumcise ... the foreskin of your heart;" 30:6; Romans 2:28-29; Colossians 2:11.)