an Eved born under the ownership of a Jew is circumcised on the 8th day: Shabbat 135b
Distinguishing between an Eved born before or after his mother went to the Ritual Bath for conversion: Shabbat 135b
Timing of circumcision if the mother was not bought, but rather only the fetus was: Shabbat 135b
Timing of circumcision if the mother was bought with a condition against converting her: Shabbat 135b