Talmud for Pesachim 197:5

Rav Huna said, if somebody dedicated his Pesaḥ and said, on condition that nobody else subscribe with me, nobody else can subscribe with him. If he dedicated it without specification, any who join are its subscribers⁸⁷From the start the Pesaḥ is dedicated for anybody who will come to join.. Rebbi Jacob bar Aḥa in the name of Rebbi Zeˋira: Does the Mishnah say so? “If thehouse be less⁸⁸Ex. 12:4., this teaches that they may continuously diminish, on condition that there always be one of the first group and one of the second group, the words of Rebbi Jehudah. Rebbi Yose says, either from the first or from the second, if only the Pesaḥ not be left alone.⁸⁹Babli 99a, Tosephta 7:7, Mekhilta dR. Ismael Bo 3, dR. Simeon ben Yoḥai p. 9. It is presumed that practice follows R. Yose (the Tanna, ben Ḥalafta.)” If you are saying that any who join are its subscribers, then the members of the first group are the members of the second group⁹⁰According to Rav Ḥuna, every subscriber is counted as original subscriber; there can be no first and second group.. What is the difference between them? If he dedicated his Pesaḥ, withdrew from it but another person subscribed to it. In the opinion of Rav Ḥuna it is qualified, in the opinion of Rebbi Zeˋira disqualified⁹¹For Rav Ḥuna, the second person is an original subscriber. For R. Zeˋira the Pesaḥ was left without subscriber for a moment; this disqualifies.. In the opinion of Rav Ḥuna it is dedication by an individual and subject to the laws of substitution; in the opinion of Rebbi Zeˋira it is dedication by partners and dedication of partners is not subject to the laws of substitution⁹²If the first subscriber left; his replacement now is the original dedicator and all the rules of Tractate Temurah (Lev.27:10) do apply. But for R. Zeˋira, supposing that the second subscriber came before the first one left and the Pesaḥ still is qualified, it now is dedication by partners and any attempt at substitution is invalid and therefore inconsequential.. If a hundred people subscribed to it simultaneously, Rav Ḥuna said, if there is the volume [of an olive for each of them], it is qualified, otherwise disqualified. Rebbi Zeˋira said, as long as there is the volume of an olive for each of them, it is qualified, otherwise disqualified⁹³Since for Rav Ḥuna all subscribers are original dedicators, simultaneous subscription is possible. The subscriptions either are all valid or all invalid. For R. Zeˋira only sequential subscriptions are possible; as long as there is the volume of an olive available for a new subscriber he is accepted, otherwise he is rejected, but the rejection has no influence on the status of subscribers accepted earlier.. And it was stated thus: “If they subscribed and added subscribers, as long as there is the volume of an olive for each of them, it is qualified, otherwise disqualified.⁹⁴Babli 78b.”