Pesachim 8:4-5

Pesachim 8:4

If one person signs others up to join him in his portion of the Passover offering (and the other members of the existing group do not want these newcomers to join them), they give him his portion, which he can eat with his party in one group, while the other members eat as a second group.

Pesachim 8:5

If a man saw a discharge twice (rendering him a zav but he need not bring a sacrifice to become clean), others sacrifice a Passover offering on his behalf when 14 Nisan is his seventh day (and he will be clean after sundown). If he saw a discharge three times (so that he is a zav who must bring a sacrifice to become clean) others sacrifice a Passover offering on his behalf when 14 Nisan is his eighth day (even if he has not yet brought his sacrifice). If a woman (who saw an emission during her clean days) is counting a clean day against an unclean day, others offer for her when 14 Nisan is her second day (when she will be clean after sundown). If she saw on two days, others offer for her when 14 Nisan is her third day. If she has been rendered a zavah, others offer for her when 14 Nisan is her eighth day.