The Gemora asks: But aren’t these people considered circumcised? We learned in a Mishna: If one takes a vow that he will not derive any pleasure from areilim (uncircumcised people), he is permitted to derive pleasure from uncircumcised Jews, but he is prohibited from deriving pleasure from a circumcised idolater. If one takes a vow that he will not derive any pleasure from mulim (circumcised people), he is permitted to derive pleasure from circumcised idolaters, but he is prohibited from deriving pleasure from an uncircumcised Jew. (It is evident that a circumcised idolater is regarded as uncircumcised.)
What is the comparison between the two cases? Perhaps it can be said that regarding vows, the halacha is that we interpret his words based on the vernacular, and an idolater is described as being uncircumcised even though they in fact are circumcised.
*** Rabbi Eliezer maintains that a convert who circumcised, but did not immerse himself yet in a mikvah is considered a full-fledged Jew; and he maintains that a child who born circumcised does not need covenantal blood to flow from him.
The Rama rules that if one circumcises a child at night, he is required to cause covenantal blood to flow from him. He also rules that if one circumcises a child before he is eight days old, he is not required to cause covenantal blood to flow from him.
What is the difference between the two cases?
*** Rava explained the braisa (the father was not considered negligent for not circumcising his son at the time of the slaughtering of the korban Pesach, but he is negligent for not circumcising him at the time of the eating) to be referring to a case where the father and mother of the child were released from prison after their korban was slaughtered. (An agent slaughtered the korban for them, but the circumcision of their child is incumbent on them to perform.)
Rashi explains that the mitzvah of circumcision rests on the father and the mother.
Doesn’t the Gemora in Kiddushin state that a woman is exempt from circumcising her son based on a verse in the Torah?
Why can’t the father appoint an agent to circumcise his son for him?