Whether one who is Impure, but will not be Impure during the time of consumption, may send his Offering with someone else: Pesachim 92b-93a, 93b-94a; Zevachim 22b
For an uncircumcised or impure person to send a korban pesach with someone else: Pesachim 62a
Whether a tevul yom may eat the Pesach Offering: Pesachim 93b
One who is kept from doing the Pesach Offering by unavoidable circumstances or human error does not get the punishment of Divine Ex-Communication: Pesachim 92b
Whether there is a punishment of Divine Ex-Communication for one who intentionally skips the first Pesach Offering: Pesachim 92b-93a
Whether one receives the punishment of Divine Ex-Communication for missing the first Pesach, first and second, or just the second: Pesachim 93a-b