(Rav Huna): Why did they enact a date in a Get? It is due to an episode that occurred;

A case occurred in which a man married his sister's daughter, and she was Mezanah while married to him. He went and predated the Get (so it will look like the Zenus was after the divorce). It is better that she be judged like a single woman [who was Mezanah], and not like an Eshes Ish (who is killed for Zenus. It mentioned that she was his niece, for a man is very fond of her. Normally, if a wife was Mezanah, her husband would not want to save her).

Opinion #1 (Rav Huna Kashisah, to R. Yakov bar Acha): Our Mishnah is like the opinion that Ma'aseros are mid'Rabanan (even in Bayis Sheni, and all the more so afterwards, for there is no Kedushas ha'Aretz). However, according to the opinion that Ma'aseros are mid'Oraisa (also Shemitah is mid'Oraisa) - would Hillel enact [to avert Shemitas Kesafim,] against the Torah?!

Question (R. Yosi): From when [Bnei Yisrael] were exiled to Bavel (Kedushas ha'Aretz ceased), they were exempted only from Mitzvos that depend on the land. Shemitas Kesafim applies in Eretz Yisrael and in Chutz la'Aretz (it does not depend on the land)!

Answer (R. Yosi): "V'Zeh Devar ha'Shemitah Shmot" - when Shemitah (abstention from working) applies to the land mid'Oraisa, Shemitas Kesafim applies mid'Oraisa in Eretz Yisrael and in Chutz la'Aretz. When Shemitah applies to the land mid'Rabanan, Shemitas Kesafim applies in Eretz Yisrael and in Chutz la'Aretz mid'Rabanan.

Opinion #2: There (in Bavel) they say, even according to the opinion that Ma'aseros are mid'Oraisa, he agrees that Shemitas Kesafim is mid'Rabanan - "v'Zeh Devar ha'Shemitah Shmot."

Rebbi says, there are two Shemitos - Shemitah and Yovel. When Yovel applies, Shemitah applies mid'Oraisa. When Yovel ceases, Shemitah applies mid'Rabanan.

Question: When did Yovel cease?

Answer: "L'Chol Yoshveha" - [Yovel applies] when all (the majority of Bnei Yisrael) dwell (in Eretz Yisrael), and not when they were exiled from it.

Suggestion: If they were on the land, and they were mixed up - Shevet Yehudah dwells in [the portion of] Binyamin, and Binyamin in Yehudah - perhaps Yovel applies!

Rejection: "Yoshveha" (when they dwell properly, i.e. in their proper places).

"L'Chol Yoshveha" (all the Shevatim must be there) - it turns out once Shevet Reuven, Gad and half of Menasheh were exiled, Yovel was Batel.