(Beraisa - R. Tarfon): He may give to her only Terumah, for Terumah is found everywhere.

R. Akiva says, he gives half Chulin and half Terumah, for women are prone to be Metamei Taharos.

(Beraisa - R. Shimon ben Gamliel): Wherever it mentions [giving] Terumah [to a wife], he gives to her twice as much as [a Yisrael would give of] Chulin.

(Mishnah): [If a man died, and his wife fell to Yibum,] the Yavam does not permit her to eat Terumah [unless she already ate in her husband's lifetime];

If she was [an Arusah for] six months in front of her husband and [Shomeres Yavam for] six months in front of the Yavam, or even all [12 months] in front of her husband, except for one day in front of the Yavam, she may not eat Terumah;

This is Mishnah Rishonah (the first version). A later Beis Din said that she does not eat Terumah until she enters Chupah.

(Gemara - R. Yirmeyah - Mishnah): A Yevamah - the first three months she is fed from [property of] her husband. If her Yavam stood in [Beis] Din and fled, she is fed from him;

If he [stood in Din and] fell ill, it is as if he fled. If he went overseas, it is as if he fled.

If a widow said 'I will remain a widow in my husband's house' (and never remarry), we heed her.

(R. Yosi citing R. Heila): A man who says 'I will not do Chalitzah (rather, Yibum)' is like one who says 'I will not divorce.' (He must feed her.)

(R. Zavda): R. Yitzchak ruled that one who says 'I will not do Chalitzah' is like one who says 'I will not divorce.'

(Beraisa): If she was six months in front of her husband and six months in front of the Yavam, she does not eat Terumah. This is not only six months in front of the Yavam, rather, even all [12 months] in front of her Yavam, lacking one day, she may not eat Terumah.

Question: This is not like Mishnah Rishonah, and not like Mishnah Acharonah!

Answer: Rather, it is like the middle Mishnah;

(Beraisa): Initially, they said that an Arusah Bas Yisrael eats Terumah. They expounded "v'Chohen Ki Yikneh Nefesh Kinyan Kaspo [Hu Yochal Bo]." If not [that this permits an Arusah], what is the difference between her and a Shifchah?

They retracted to say [that she eats Terumah only] after 12 months, when he becomes obligated to feed her.

A later Beis Din said that she never eats Terumah until she enters Chupah.

R. Yochanan ben Bag Bag sent to Rebbi Yehudah ben Beseira 'they said in your name that Bas Yisrael Arusah [to a Kohen] eats Terumah!'

Rebbi Yehudah ben Beseira: It is established to me that you are an expert in hidden matters of Torah, even to expound a Kal va'Chomer. Do you not know that a Shifchah Kena'anis, Bi'ah does not acquire her, to feed her (permit her to eat) Terumah, but money acquires her to feed her Terumah?

A woman, that Bi'ah acquires her to feed her Terumah, all the more so money acquires her to feed her Terumah!

What can I do? They said that a woman never eats Terumah until she enters Chupah. They supported this from a verse - "Kol Tahor b'Veischa Yochalenah."

Question (R. Yudan): There is a challenge against this Kal v'Chomer! He can say to him, no - if you said about a Shifchah Kena'anis, that Chazakah acquires her [also money acquires her to feed her Terumah], will you say about (learn to) a woman, that Chazakah does not acquire her?!

Any Kal v'Chomer that there is a challenge against it, it is Batel.