(R. Ze'ira citing Shmuel): A man can annul all vows, except for one who says 'benefit from me is Al (forbidden to) Ploni.'

Question: This implies that 'benefit from Ploni is Alai', he can annul. Our Mishnah taught 'Peros of this grocer are Alai', he cannot annul!

Answer: He establishes [our Mishnah] like R. Yosi, and [Rabanan] argue with him, for it teaches there (in the Seifa) 'if his Parnasah (all his food) is only from him, he can annul', [R. Yosi says so. Presumably, also the Reisha is R. Yosi.]

(R. Yosi): [R. Yosi holds that he buys only from him because] this [grocer] lends to him and gives to him [food] on credit.

(R. Mana): [R. Yosi holds that he buys only from him because] he gives to him good grain.

(Mishnah): [If she vowed] 'Konam, I will not benefit from the creations (i.e. people)' [he] cannot annul this (for she did not refer to him. Also,) she can benefit from Leket, Shichechah and Pe'ah (sheaves that drop or were forgotten during harvesting, and a corner of the field not harvested; all of these are left for the poor);

'Konam, Kohanim and Leviyim will not benefit from me', they may take (tithes and gifts due to them) against his will;

[If he forbade] 'these Kohanim and Leviyim', others take [the tithes and gifts].

(Gemara - R. Yochanan): Our Mishnah says that she can benefit from Leket, Shichechah and Pe'ah [but not from Ma'aser Oni].