God's commandments were given to the Jewish people. God's directed them to keep the commandments forever. God is teaching the principle of a changed heart, a correct heart motive, and not law.
Man trusting themselves is still under it.
Jews Timotheus, a Jew because his mother is Jewish, needed to be circumcised. The Jewish believer trusts in the blood of Jesus for his righteousness. That of Jesus work. All nations shall worship God in a Jerusalem in the name of Jesus. Jesus death on the cross showed His great love for the Christians by taking their sins.