Similarly, harvested olives that were mixed with gleaned olives, [or] harvested grapes [that were mixed] with oleilos grapes, if one has a supply from elsewhere, he may separate [tithes] proportionally. But if not, he must separate terumah and terumas maaser for the entire [mixture], and the remaining maaser rishon and maaser sheni proportionally.

[If] one takes sourdough from a wheat dough and places [it] into a rice dough, if it has the taste of grain, it is obligated in challah; but if not, it is exempt. If so, regarding what did they say [that] tevel forbids [a mixture even] in minute concentration? A kind with its [like] kind; but with an unlike kind, [tevel prohibits only] when [it] imparts taste [to the mixture].

[If] two women made two kav [doughs], and they touched one another, even if they are of the same kind, they are exempt. But when they belong to one woman, a kind with its own kind is obligated, but with a different kind it is not obligated.

What is a kind with its own kind? Wheat does not combine with anything except with spelt. Barley combines with everything, except for wheat. R' Yochanan ben Nuri says: The other species combine with one another.

Two [doughs] of a kav and a rice [dough] of a kav or a terumah [dough] of a kav in the middle do not combine. [If] something whose challah was taken [was] in the middle, they combine, since it was once obligated in challah.

A kav of new [flour] and a kav of old [flour] that “bit” into one another, R' Yishmael says: He takes [challah] from the middle. But the Sages forbid [this]. [If] someone took challah from a kav [of dough], R' Akiva says: [It is] challah. But the Sages say: It is not challah.

Two kav [doughs]; the challah of this one was taken by itself, and [the challah] of this one by itself, [and] he then made them into one dough, R' Akiva exempts [the dough], but the Sages obligate [it]. It thus emerges that his stringency is his leniency.

One may take an amount [of dough] for challah from a dough whose challah has not been taken, to make it in taharah, in or-der to continuously separate from it challah of demai, until it spoils. Because challah of demai may be taken from [dough that is] tahor on behalf of [dough that is] tamei and from that which is not in [their] proximity.

Jews who were sharecroppers for idolaters in Surya, R' Eliezer obligates their produce in tithes and Sheviis, but Rabban Gamliel exempts [them]. Rabban Gamliel says: Two [portions of] challah in Surya. But R' Eliezer says: One [portion of] challah. They grasped the leniency of Rabban Gamliel and the leniency of R' Eliezer. They changed to act in accordance with the words of Rabban Gamliel in both ways.

Rabban Gamliel says: There are three lands for challah. From the Land of Israel up to Keziv, one challah [portion is taken]. From Keziv until the river and until Amanah, two challah [portions]; one for the fire and one for the Kohen. [That] for the fire has a measure; [that] for the Kohen, does not have a measure. From the river until Amanah inwards, two challah [portions]; one for the fire and one for the Kohen. [The portion] for the fire does not have a measure; [the portion] for the Kohen has a measure. And a tevul yom may eat from it. R' Yose says: He does not need immersion. And it is forbidden to a zav, zavah, niddah, and a woman who has given birth, and it may be eaten with a non-Kohen at the [same] table, and it may be given to any Kohen.

And these are given to any Kohen: charamim, firstborn [animals], redemption of a [firstborn] son, redemption of a firstborn donkey, the foreleg, jaws, and abomasum, the first of the fleece, oil [of terumah temei'ah] for burning, consecrated items [of] the Temple, and bikkurim; R' Yehudah forbids bikkurim. Bitter vetch of terumah, R' Akiva permits, but the Sages forbid.

Nitai of Tekoa brought challah portions from Beitar, but [the Sages] did not accept [it] from him. People from Alexandria brought their challah [portions] from Alexandria, but [the Sages] did not accept [them] from them. People from Mount Tze-voim brought their bikkurim before [the festival of] Shavuos, but [the Sages] did not accept [them] from them, because of what is written in the Torah (Exodus 23:16): And the festival of the harvest, the first fruits of your labors, which you sow in the field.