Sanhedrin 76 - March 3, 3 Adar

Presentation If we compare a man's relatives to his wife's relatives, as was stated in the braita quoted earlier, then just as his daughter-in-law is forbidden, why isn't his wife's daughter-in-law forbidden to him? Abaye and Rava each explain differently why the comparison would not work for this case.  What is the source for deriving that a man's daughter from rape or out of wedlock would be forbidden by penalty of burning? Where is the negative commandment for this in the Torah? Three different answers are brought. The last opinion derived the negative prohibition from Vayikra 19:29 "Do not disgrace your daughter to zenut." That verse also teaches that a father can't sell his daughter to be a prostitute. How are two things derived from the same verse? Rava and Abaye, who do not derive the original law (forbidding a father to his daughter from rape) from here, derive another law from here, that a father cannot marry of his daughter to an old man, as that may lead her to commit adultery. Other statements are brought to prevent a father from marrying or not marrying off his daughter out of self-interest.  Rabbi Akiva and Rabbi Yishmael disagree about how to interpret the verse regarding the death penalty for a man who engages in sexual relations with his wife and mother-in-law. It says in the verse that he dies and they die. To who is "they" referring? Rava and Abaye explain their debate in two different manners.   Who gets punished by decapitation by the sword? A murderer and members of an idolatrous city (ir hanidachat). If one prevents another from getting out of the water and they drown, the murderer is liable, but if one pushes another into the water and the person can get out, but instead they die, the one who pushed the person in, is exempt.