Pesahim 90a and Pesahim 90b, how much Jews own their sacrifices, such as for whether they can turn it into etnan zonah, a payment for a Biblically prohibited type of relations, and/or what money collected to share in a Pesah sacrifice can be used to purchase. Then, the topic of how close to ritual purity a Jew must be to be included in a Pesah, on the assumption s/he will become fully ready to eat it by that evening.
