21 But Nephi said unto them: O ye fools, ye uncircumcised of heart, ye blind, and ye stiffnecked people, do ye know how long the Lord your God will suffer you that ye shall go on in this your way of sin?
The fact that the label of “uncircumcised of heart” still had resonance among the Nephites suggests continued observance of the law of Moses and rituals such as circumcision. Otherwise this criticism would not have made sense.

I love the description of hardheaded individuals as uncircumcised. Circumcision is a symbol of willingness to subjegation the flesh and consecrate even your own body in the name of God. Circumcision symbolized the covenant relationship and the willingness to follow the will of God. These Nephites had made such covenants through circumcision and perhaps through baptism, but their hearts were nevertheless far from God. Nephi points out that despite their covenants, these Nephites were far from God. This is a powerful indictment of a covenant people.