The new covenant that God promised to make with His people included major changes to their hearts. He promised to give them a “new” heart (Ezekiel 36:26). The new heart would be “one” with His (Ezekiel 11:19).
It would have “His law written on it” (Jeremiah 31:31-34) and it would be “circumcised” (Deuteronomy 30:6). Circumcision was given to Abraham as a sign of the covenant that He was making with God (Genesis 17:10-14). Typically it was performed on boys when they were eight days old (Leviticus 12:2-3).
It was a sign of the parents’ faithfulness, not the boy’s. The removal of the foreskin symbolized removing a portion of ourselves that was not necessary. It represents our need to remove our sin nature in favor of living in accordance with God’s way.
God commanded another type of circumcision which occurs internally, not externally. A circumcision for both males and females. “So circumcise your heart, and stiffen your neck no longer” (Deuteronomy 10:16).
Again in Jeremiah 4:4 He commands us to “circumcise yourselves to God and remove the foreskin of your heart.” The heart is the center of our will and desires. He is calling on believers to cut away the sin nature that directed their hearts prior to salvation.
God realizes we are incapable of circumcising our hearts, so He promises to do it for us. “Yehovah your God will circumcise your heart and the heart of your descendants, to love Yehovah your God with all your heart and with all your soul,.