Study Guide Shabbat 137 This week’s learning is sponsored by Margie Zweibel in honor of Howie Shocket, Chaim Tzvi ben Yenta Bluma. He is in our tefillot. Today’s daf is sponsored by The Mitchell Family in honor of Rabia Mitchell’s birthday. Mazel tov! In which additional case does Rabbi Yehuda hold that an andrgyne is considered a case of doubt and not for sure male? If there are two babies (of one father) and was born on Friday and the other on Shabbat and the father mistakenly circumcises the Friday baby, or there were two babies one born on Sunday and one born on Shabbat and the father mistakenly circumcises the Sunday baby, is he obligated to bring a sacrifice for unwittingly desecrating Shabbat? Rabbi Eliezer and rabbi Yehoshua disagree in one of the cases and agree in the other but it is not clear in which case do they agree and do they both agree one is obligated or exempt? Three versions are brought in the gemara. The underlying issues is: does the fact that one performed a mitzva or was involved in trying to perform a mitzva exempt him from bringing a sacrifice for desecrating Shabbat? One can perform the brrit milah sometimes on the 9th, 10th, 11th or 12th day after the birth and still be circumcising in its proper time. The mishna describes each case and why. When is brit milah in its proper time for a child who is sick? What are the additional pieces of skin that must be removed in order for the circumcision to be valid? If someone is overweight, more needs to be removed so it will not appear (marit ayin) as if he isn't circumcised. If one is overweight, how can it be determined whether or not more needs to be removed? What blessings are recited at the brit milah? How are the blessings different for a convert and a Canaanite slave? Can one hang a wine strainer on Yom Tov? Is it a problem of building? Can one pour wine into an already set up wine strainer even on Shabbat? Rabbi Eliezer and the rabbis debate this issue. Rabbi Eliezer is lenient. How does it connect with Rabbi Eliezer's stringent opinion about the window shutter where he forbids adding to an already existing temporary tent?