A merchant once came to Tiveria with a load of raisins. Gamliel Zuga asked R. Ba bar Kahana as to their status. R. Ba answered - the whole of Eretz Yisrael doesn't produce this load of raisins (so they must be from Chutz LaAretz).

Question: The whole of Eretz Yisrael doesn't produce this load of raisins?! Rather, he told him, "There's no one place in Eretz Yisrael that produces such a load of raisins, (so it must have come from Chutz LaAretz)."

In Sheviis, a person once brought a box of leeks to sell to R. Yitzchak bar Tavlai. He asked R. Yochanan whether he should be concerned for Sefichin brought from Eretz Yisrael proper.

(R. Yochanan to R. Yitzchak bar Tavlai): Go and ask Chananya ben Shmuel, as I learned with him a Baraisa about this.

He asked Chananya, who responded that R. Yochanan did not show him the Baraisa; he merely reviewed it with him - as R. Yasa cited R. Yochanan as saying that Rebbi and R. Elazar b'R. Shimon disagreed - one said that we assume that the merchant brought them from his place of residence. The other said that we assume that they came from where he is currently located when he sells them.

(R. Abahu explains): Rebbi said that it follows his place of residence and R. Yochanan ruled like R. Elazar b'R. Shimon, that it follows his current location. But R. Yochanan only rules this way when he sells from one box (as such a small amount can be assumed to have been bought in the same place), but when there is a large container, all agree that we follow the place of the merchant's residence.

Question: Even if his place of residence and his current location are places where tithing does not need to be done, but perhaps if it was to be taken through a place where tithing is done, he actually bought it there and didn't tithe it? No, this is not a concern.

Question (R. Ba bar Kohen to R. Yosi): Didn't R. Chiya say in the name of R. Yochanan that when Rebbi disagrees with one of his colleagues, the Halacha follow Rebbi? And R. Yona said that this even applies when Rebbi disagrees with R. Eliezer b.R' Shimon?

Answer (R. Yosi): What do you want from R. Yochanan? He follows his reasoning that they made a leniency in Sheviis, since nowadays it is Mi'D'Rabbanan. Some say that the opinion of R. Yochanan was like R. Elazar b.R' Shimon, so together they combined to outnumber Rebbi.

(Mishnah): One who wishes to be trusted for Maaseros should tithe whatever he sells and whatever he eats and whatever he buys and he should not be a guest at the home of an Am HaAretz.

(R. Yehuda): Even one who is a guest at the home of an Am HaAretz could still be trusted.

(Chachamim to R. Yehuda): If he isn't trusted for his own consumption, could he be trusted for others?

(Gemara): 'He should tithe whatever he buys' - if he is buying it to eat it, it already taught 'whatever he eats'?

Rather, he is buying it on order to sell? But it already taught 'whatever he sells'?

Rather, if he bought Demai produce to sell, he should tithe it beforehand; if he wants to sell Tevel from his field, he must first tithe it.

Baraisa (R. Yehuda): Landowners have never refrained from being guests of their fellow landowners and nevertheless, they have been careful to tithe their own Demai.

(R. Yona): Chaverim are not suspecting of eating from others or of feeding others.

(R. Yosi): Chaverim are suspected of eating but not of feeding others.

The Mishnah disagrees with R. Yosi - Chachamim said to R. Yehuda - If he isn't trusted for his own consumption, could he be trusted for others?

The words of the Chachamim assist R. Yosi - R. Chanina/ R. Yasa cited R. Yochanan as saying that R. Yehuda agreed that the Chaver loses his believability after he eats at the house of the Am HaAretz, but not while he is eating there.

And if you say that Chaverim are not suspected of eating from others or of feeding others; why would there be a difference between during his eating and after his eating?

(Baraisa): If a person accepted upon himself everything (listed in the Mishnah) except for one thing, he is not accepted. One who is suspected for one thing is suspected for everything.

(R. Yehuda): He is only now suspected for that one thing.