Yevamot 28 - April 4, 3 Nissan

Study Guide Yevamot 28 Today's daf is sponsored by Tina Senders Lamm for a refuah shleima of Fruma Devorah bat Chana. Rabbi Yochanan had answered the difficulty raised by Rabbi Yosi son of Rabbi Chanina based on the Mishna by rejecting the Mishna. The Gemara suggests all sorts of other possibilities Rabbi Yochanan could have used without having to reject the reading of the Mishna and then explains the weakness of each suggestion. Another question is raised against Rabbi Yochanan from the continuation of our  Mishna. To resolve this, the Gemara answers that the case in the Mishna happened in a particular order. There are different versions brought of the debate between Beit Shamai and Beit Hillel mentioned in the Mishna regarding a case where both brothers went ahead (against the law) and married both sisters, do they need to divorce them? A comparison is made between the cases in our Mishna and cases brought in the Mishna on Yevamot 20. Since they are based on the same principle, why are the cases in our Mishna necessary? Why was it necessary for our Mishna to bring a case when two sisters are forbidden to both brothers to whom they fall to yibum, if it already brought a case of one forbidden to one brother? Couldn't we derive one from the other? Why was the second part of the Mishna brought (with two women who are forbidden to two brothers) when that could have been derived from the earlier case in the Mishna of one sister forbidden to one of the brothers? "This is the case of..." What is it coming to exclude and why? The braita of Rabbi Chiya is brought who connected the Mishna to the first Mishna in Yevamot and said that all of those cases of forbidden relationships (15) can have a case of two sisters who are each forbidden to one of the brothers and therefore can each do yibum with the other. There are three interpretations brought as to whether it can really apply to all the cases of the Mishna or not.