One may not set aside Terumah [produce set aside for priestly consumption] from the pure for the impure. And if they set the Terumah aside, their Terumah is [valid] Terumah. Truly they said, the fig round, some of which has been made impure, one may set aside Terumah from the pure that is in it for the impure that is in it. And so too with a bundle of greenery, and so too with a pile. If there were two rounds, two bundles, or two piles--one impure and one pure--one may not set aside Terumah from one for the other. Rabbi Eliezer says: one may set aside Terumah from the pure for the impure.

One may not set aside Terumah from the impure for the pure. And if he accidentally set the Terumah aside, their Terumah is [valid] Terumah. If intentionally, [it is as if] he has done nothing. And so too with a Levite who had tithes from which Terumah had not been taken, and was continuously designating [parts of these impure tithes as the Terumah of other tithes]: if accidentally, what he did is done [with validity]. If intentionally, [it is as if] he has done nothing. Rabbi Yehudah said, if he knew that it was [impure] in the beginning, even if he [forgot and designated] accidentally, [it is as if] he has done nothing.

One who immerses vessels on the Sabbath accidentally may use them. Intentionally - he may not use them. One who tithes or cooks on the Sabbath accidentally may eat of it. Intentionally - he may not eat of it. One who plants on the Sabbath accidentally may allow it to grow. Intentionally - he must uproot [the plant]. If it is during the Sabbatical year, whether it was accidental or intentional - he must uproot.

One may not set aside Terumah from one species for a different species. And if he set the Terumah aside, his Terumah is not [valid] Terumah. All species of wheat are [considered] one [species]. All species of figs and dried figs and pressed figs are one, and one may set aside Terumah from one for the other. Any place where there is a Kohen [member of priestly caste], the Terumah should be set aside from the finer species. And any place where there is not a Kohen, the Terumah should be set aside from the longer lasting species. Rabbi Yehudah said, he should always set the Terumah aside from the finer species.

One should set aside as Terumah a whole small onion, rather than half of a large onion. Rabbi Yehudah said: not so, rather half of a large onion. And thus did Rabbi Yehudah say, one should set aside as Terumah onions from within the towns for [onions from within] the villages, but not [onions] from within the villages for [onions from within] the towns, because it is the food of the aristocracy.

One should set aside Terumah oil olives for pickled olives but not pickled olives for oil olives, and unboiled wine for boiled wine but not boiled wine for unboiled wine. The rule is that for any species that is considered Kilayim [forbidden mix of two species] with another species, one should not set aside Terumah from one [species] for the other [species], even from the good [species] for the bad [species]. And any species that is not considered Kilayim with another species, one may set aside Terumah from the good [species] for the bad [species], but not from the bad [species] for the good [species]. But if one set aside Terumah from the bad for the good, his Terumah is valid Terumah, except for from darnel [a poisonous rye grass] for wheat, since [darnel] is not a food. The gourd and the cucumber are one species. Rabbi Yehudah says [they are] two species.