76 Pesachim 8:5-8

(5) If a zav [a male who has certain types of atypical genital discharges, which render him impure] has experienced a discharge twice [within the course of two days], we may slaughter [a Pesach sacrifice] for him [to eat from] on the seventh day [after these discharges, should it come out on the fourteenth of Nissan]; if he has experienced it thrice [within the course of three days], we may [only] slaughter [it] for him on the eighth day [after these discharges, should it come out on the fourteenth of Nissan]. If [a woman experiences an atypical discharge of blood such that she must] make sure that she is pure the next day, we may slaughter [a Pesach sacrifice] for her on the second day [after this discharge, should it come out on the fourteenth of Nissan]; if she experienced [such a discharge] for [two] consecutive days, we may slaughter [it] for her on the third day [after these discharges, should it come out on the fourteenth of Nissan]; and if she [experienced such a discharge for a third day and now] is a zavah [a female who has certain types of atypical genital discharges, distinct from her menses, which render her impure], we may [only] slaughter [it] for her on the eighth day [after these discharges, should it come out on the fourteenth of Nissan].

(6) [In the case of] an ‏onen‎ [a person whose close relative has died but has not yet been buried]; or one who excavates a heap of fallen ruins [in order to rescue someone buried underneath]; or one who has been promised to being released from prison; or an old or sick person able to eat [the minimum quantity of meat required which is] a kazayit, we may slaughter [a Pesach sacrifice] for them [to eat from]. In all [of these cases], we may not slaughter for them [on their account] alone, lest they bring [cause] the Pesach sacrifice to become disqualified; therefore, [when we take such a precaution], if one of the [above individuals actually] becomes disqualified [to eat it], he is exempt from making [a Pesach sacrifice on] Pesach Sheni: except for the one who excavates the heap [and finds someone already dead], since he is impure from [the very outset].

(7) We may not slaughter a Pesach sacrifice for a single individual - so says Rabbi Yehuda. But Rabbi Yose permits [it]. We may not slaughter [a Passover sacrifice, even] for a company of a hundred [individuals], if [none of them] are able to eat a kazayit. Neither may a company to eat it be formed of women, slaves and minors [only].

(8) An ‏onen may eat his Pesach sacrifice in the evening, after he has immersed himself [in a mikveh], but [he may] not [do so] with [other] sacrifices; but one who has [only] received the information of the death of a near relative [who has already been buried], or one who has the bones [of a deceased close relative] gathered for him, may eat of [other] sacrifices, after he has immersed himself. If a convert converted on the eve of Pesach; Beit Shammai says, "He should immerse and eat his Pesach sacrifice in the evening." But Beit Hillel says, "One who has [just] separated from the foreskin is considered like one who has [just] separated from the [impurity caused by contact with the] grave."