(Mishnah): The following do not have a minimum quantity (according to the Torah, in order to fulfil one's obligation, but there is a Mitzvah to increase them) - Peah (that one must leave the crops on the corners of his field for the poor); Bikurim (the first fruits that are brought to the Kohen in the Temple); Ra'ayon (the requirement to come to the Temple on the three Regalim - Pesach, Shavuos and Succos); Gemilus Chasadim (acts of kindness) and Talmud Torah (Torah study).

For the following Mitzvos, a person eats from their fruits (i.e. a small part of the reward) in this world and the principal (reward) is in the world to come - honoring one's parents, Gemilus Chasadim, making peace between people; and the reward for Torah study is equal to all of them.

(R. Binyamin bar Levi): R. Yitzchak and R. Ami both asked - why does the Mishnah not include separating Terumah in its first list?

Answer (R. Ami): Because it is a dispute (in Maseches Terumos Perek 4 Mishnah 5) as to whether or not it has a specific amount.

Answer #2 (R. Yosi): A person may make his entire field into Bikurim but he may not make his entire field Terumah (meaning that even though it does not have a lower limit, Terumah has an upper limit).

Rebuttal: Peah is listed in the Mishnah and one may not make his entire field Peah...?

Response (R. Yosi): The cutting of the first stalk (for Peah) is like the smoothing of the pile (for Terumah, that makes it obligated in Terumah) - before he cuts the first stalk of the field, it is not yet obligated in Peah - once he does, he may make his entire field Peah. However, before he smoothed the pile, it is not obligated in Terumah and once he does smooth it, he may not make the entire pile Terumah...

As the Mishnah teaches - One who says that all of his threshing floor should be Terumah or all of his dough should be Challah, has not said anything unless he leaves a small part.

Question: When the obligation comes onto the field, does the first stalk also become obligated in Peah?

Answer: Since cutting the first stalk obligates the field, you cannot obligate the first stalk in Peah.

Question: If he cut the first stalk and it was somehow burned up, must he cut a second stalk to obligate the field?

Answer: If a person cut half the field and then sold or consecrated that half, he must separate Peah for the entire field. Isn't consecrating like burning (since one may not gain benefit from it)? This shows that if the first stalk burned, there is no need to cut another one.

If a person cut the whole field without leaving Peah, he must separate it from the detached stalks.

Question: Since the obligation comes on the detached stalks, is the first stalk also obligated?

Answer (R. Yosi): Learn about the Peah of the detached stalks from the the Peah when it was still standing - just as when standing, the obligation of Peah does not go onto the first stalk, the same applies to the detached stalks.