(Mishnah): One who hired workers to work with trees of Neteh Revai (a fruit tree in its fourth year - the fruit of that year is holy and must be brought to Yerushalayim for consumption), they may not eat from it.

If he did not inform them, he should redeem the Kedushah of the fruit onto coins and then give them the fruit to eat.

If the employer's igulei develah (circular shaped cakes made from figs pressed together) required pressing together, or his opened barrels required closing, the workers may not eat from them (because they are tevel - untithed produce). If the employer had not informed them (that they would be working with tevel, meaning that they were expecting to be able to eat from it), he must tithe them and then they can eat.

(Gemara): Even if it is this work that will obligate it in Maaseros, a worker may not eat, Also, if there is another prohibition on this produce, such as Neteh Revai, he may not eat. In such cases, if the employer hired the worker without specifying, the employer must redeem the Kedushah of Neteh Revai from it and he can then feed the workers with it.

If the worker stipulated that even though the Torah does give him the right to eat, he is hiring himself out to receive the food, he may eat.

However, if he is working with anything that will not cause an obligation of Maaseros (such as produce that has not yet grown a third of its growth) and no other prohibition rests on it, if he hired the worker without specifying, he cannot eat.

But if the worker stipulated that even though the Torah does give him the right to eat, he is hiring himself out to receive the food, he may eat, (meaning that the employer must redeem the Neteh Revai and feed him with it).

(Mishnah): Watchmen of detached fruit eat based on custom but not according to the Torah (because they are merely watching the fruit rather than physically working on them. Therefore, although they do not eat the fruit based on the Torah's authority, they may still eat because that is the custom).

There are 4 types of watchmen - an unpaid watchman, a borrower, a paid watchman and a renter.

An unpaid watchman may swear (and become exempt) from everything (i.e. accidental damage, theft or loss); a borrower must pay for everything; a paid watchman and a renter may swear (and become exempt) for being broken, taken captive and death, but they must pay for loss and theft.

(Gemara) - Rav Huna: The Mishnah is referring to watchmen of fruit, but watchmen of vegetable gardens and orchards may eat (even) according to the Torah.

Shmuel: The Mishnah is referring to watchmen of gardens and orchards, but fruit watchmen may not eat, neither according to the Torah, nor legally.

Beraisa (Rav Chiya) supporting Rav Huna: Concerning the Kohen who burns the Red Heifer, the Torah repeats (Bamidbar 19, 7), "...and the Kohen will be impure until sunset'' - this includes those who guarded the Red Heifer, that their clothes also become impure (and it is as if they were physically involves in the process).