PAST DEDICATION
BAVA METZIA 90 (3 Av) - dedicated l'Iluy Nishmas Reb Aharon Dovid ben Elimelech Shmuel Kornfeld (Muncasz/Israel/New York), who passed away on 3 Av 5761, by his daughter Diane Koenigsberg and her husband Dr. Andy Koenigsberg. May his love for Torah and for Eretz Yisrael persevere in all of his descendants.

Bava Metzia Chart #17a (from Hebrew chart)

Chart for Bava Metzia Daf 90a

HOW DO WE RECONCILE THE TWO CONTRADICTING BERAISOS REGARDING WHETHER ONE TRANSGRESSES THE PROHIBITION OF "LO SACHSOM" WHILE ONE'S ANIMAL THRESHES PRODUCE OF TERUMAH AND MA'ASER?

(A)
THE FIRST BERAISA (HE DOES NOT TRANSGRESS "LO SACHSOM")
(B)
THE SECOND BERAISA (HE DOES TRANSGRESS "LO SACHSOM")
TERUMAH
1a 1ST ANSWER Terumah (1) Gidulei Terumah
1b 2ND ANSWER Terumas Ma'aser Vadai (1) Terumas Ma'aser Demai
MA'ASER
2a 1ST ANSWER Ma'aser Rishon Ma'aser Sheni
2b 2ND ANSWER Ma'aser Sheni
acc. to Rebbi Meir
Ma'aser Sheni
acc. to Rebbi Yehudah
2c 3RD ANSWER Ma'aser Sheni Vadai Ma'aser Sheni Demai
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FOOTNOTES:

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(1) In the beginning of the Sugya, Rashi (DH Terumah u'Ma'aser) explains that one does not transgress "Lo Sachsom" when the animal is working with Terumah or Ma'aser (that is, even Ma'aser Rishon) because the word "b'Disho" of the verse (Devarim 25:4) is not referring to threshing of Terumah and Ma'aser produce, since it is not common for produce to be threshed before it is winnowed (and Terumah and Ma'aser is separated after winnowing, normally). When the Gemara concludes that only to Ma'aser Sheni -- which is "Mamon Gavohah" and belongs to Shamayim -- does the prohibition of "Lo Sachsom" not apply, but it does apply to Ma'aser Sheni, Rashi (DH Mamon Gavohah) gives a different reason for why one does not transgress "Lo Sachsom" -- it is because such produce is not fit to be eaten by the animal (and thus it cannot be called "b'Disho," as Tosfos DH v'ha'Dashos says). (MAHARSHA)

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