Daf Yomi - Sukkah 26 - Quoted from the Mishna

The Mishna states that if one eats food that measures less than the size of an egg, he is not obligated to sit in the Sukkah. The Mishna relates an incident where they brought in front of Rabban Yochanan ben Zakai and Rabban Gamliel food to taste and they would not taste the food until it was brought into the Sukkah. The Gemara explains that this story indicates that if one wants to be stringent on himself and eat even a snack inside the Sukkah, he is permitted to do so. The Gemara in Yoma 79 cites this Mishna and concludes the citation by stating that the reason that the rabbis ate in the Sukkah was not because the Halacha is like that. Rather, it was because the rabbis wanted to be strict on themselves. The Oneg Yom Tov writes that from the text of the Gemara it would seem that the conclusion is part of the Mishna when in fact, it is an addition of the Gemara. The Oneg Yom Tov writes that this is a rule throughout the Talmud that when a Gemara qualifies a statement of the Mishna, the Mishna can be quoted with the addition of the Gemara as if the addition of the Gemara is part of the Mishna. It is noteworthy that Tosfos in Yoma expresses the same idea as mentioned by the Oneg Yom Tov. Reb Yeshaya Pik in his glosses to the Gemara in Yoma notes that it would seem from the words of Tosfos that Tosfos did not have the same version of the Gemara that we have. Our text explicitly states the words vetoni aloh, and a Baraisa taught concerning this Mishnah. According to our version of the Gemara, there would be no proof to the concept expressed by Tosfos and the Oneg Yom Tov.