Today’s daf (=page) opens with the statement of harifei d’Pumbedita – “the sharp ones of the city of Pumbedita” – that one meal-offering sacrifice can disqualify another meal-offering sacrifice. That is to say, that if at the moment the kohen is placing the fistful of flour taken for sacrifice on the altar he thinks to himself that he will bring the frankincense on the next day – which is after the time that it is permitted to be brought – the sacrifice become pigul, it is disqualified.
The Gemara continues that this is true even according to the opinion that a sacrifice does not become pigul unless the inappropriate thought referred to the entire essence of the sacrifice (see the position of the Hakhamim in the Mishnah onyesterday’s daf, as well as that of Rabbi Yossi in the Mishnah on daf 13a). Nevertheless, here it is considered the entire essence of the sacrifice since the fistful of flour and the frankincense are placed together into the Temple vessel.
Who are the harifei d’Pumbedita who taught this rule?
In Masechet Sanhedrin (17b) the Gemara says that this was the nickname for Eifa and Avimi, the sons of the Sage Rahvah of Pumbedita, who was a student of Rav Yehudah, the founder of the great yeshiva in that city. These two brothers are mentioned a number of times in the Talmud, mainly in the context of questions that they asked others or thehalakhic arguments that they had with one another. For example, the Gemara relates how Eifa reviewed all of MasechetShevu’ot before Rabbah and Avimi tested him and asked questions on his words.