(Mishnah): One who betrothed using his portion of Kodshim (sacrifices), whether Kodshei Kodshim (which is eaten only by Kohanim) or Kodshim Kalim, she is not betrothed.

R. Meir: (If he used) Maaser Sheni, whether shogeg (inadvertently) or meizid (intentionally), she is not betrothed.

R. Yehudah: If it was meizid, she is betrothed, if it was shogeg, she is not betrothed.

R. Meir: If he used Hekdesh (consecrated to the Temple) meizid, she is betrothed, shogeg she is not betrothed.

R. Yehudah: Shogeg she is betrothed; meizid she is not betrothed.

(Gemara): R. Elazar said that the first statement of the Mishnah (i.e. with his portion) is agreed to by all. R. Yochanan said that it is actually a dispute and it was said by R. Meir.

Mishnah in Maseches Maaser Sheni: The bechor (firstborn animal) can be sold alive if unblemished and alive or slaughtered if blemished and it can be used to betroth a woman.

R. Yehudah ben Pazi citing R. Yehoshua ben Levi: It can only be sold alive, but not slaughtered.

R. Yehudah ben Pazi: R. Meir learns all Kodshim from Maaser B'hemah (tithe of one's animals)-just as Maaser B'hemah may not be used to betroth, so too all Kodshim may not be used to betroth.

R. Yehudah learns all Kodshim from bechor - just as a bechor can be used to betroth, so too all Kodshim can be used to betroth.

Question: The opinion of R. Yehudah ben Pazi seems to have switched - there (our Mishnah), he said that whether it is alive or even slaughtered it can be used for Kidushin (as the Mishnah discussed "his portion'' of a slaughtered sacrifice); but here (in Maaser Sheni), he said only if it is alive, not slaughtered...?

Answer: There (i.e. our Mishnah) he spoke for himself; here (Maaser Sheni), he was quoting R. Yehoshua ben Levi.

You could even answer that in both cases he spoke for himself - our Mishnah refers to when he betrothed with it when it was alive and 'his portion' means the portion that he would get after it is slaughtered.

Question: What is R. Yehoshua ben Levi's source?

Answer: The pasuk states in reference to a slaughtered bechor (Bamidbar 18, 18), "...and their flesh will be yours like the breast of the waving etc.'' - just as the breast (and thigh) cannot be used to betroth, since it came from the 'property of Hashem', so too the bechor after slaughtering.

Question: What is the R. Yehudah ben Pazi's source?

Answer: The pasuk says 'shall be yours' - even after it is slaughtered, it shall belong to you.

Question: How does R. Yehoshua ben Levi use that phrase?

Answer: '...shall be yours' - teaches (not to compare it to a Todah sacrifice that can only be eaten for a day and a night, but rather to a Shelamim) that can be eaten for two days and one night.