And once it dies, it contracts to be more than three handbreadths from the roofing, and it does not enter his mind to fix it because it is not noticeable. In that case, the principle of lavud would not apply, and the result would be a wall that is less than the minimum requisite height.

The Gemara asks: And did Abaye actually say that Rabbi Meir is concerned about potential death with regard to the sukka walls and that Rabbi Yehuda is not concerned? Didn’t we learn in a mishna: With regard to the daughter of an Israelite who married a priest and her husband went to a country overseas, she may continue to partake of teruma as the wife of a priest, as the presumptive status of her husband is that he is alive? Apparently, in the absence of evidence to the contrary, the presumption is that one who is alive remains alive.

And we raised a contradiction from a different mishna: If one is leaving his place of residence, and in order to preclude a situation where his wife would have the status of a deserted wife he gives her a conditional bill of divorce and stipulates: This is your bill of divorce that will take effect one hour prior to my death, it is prohibited for her to partake of teruma immediately due to the concern lest he die in the next hour. Apparently, there is concern lest one die at any point.

And Abaye said in resolving the contradiction: This is not difficult. This mishna, where the presumption is that one who is alive remains alive, is in accordance with the opinion of Rabbi Meir, who is not concerned about potential death. That mishna, where there is concern lest one die at any point, is in accordance with the opinion of Rabbi Yehuda, who is concerned about potential death.

The Gemara cites proof that these are the opinions of those tanna’im. As it is taught in a baraita: In the case of one who purchases wine from among the Samaritans and there is reason to suspect that teruma and tithes were not taken, and he is not in a position to separate teruma, he acts as follows. If there are one hundred log of wine in the barrels, he says: Two log that I will separate in the future are teruma, as the mandated average measure of teruma is one-fiftieth; ten log are first tithe; and a tenth of the remainder, which is nine log, are second tithe. And he deconsecrates the second tithe that he will separate in the future, transferring its sanctity to money, and he may drink the wine immediately, relying on the separation that he will perform later. This is the statement of Rabbi Meir.