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1. There is a dispute about whether one may use Ma'aser Sheni in Yerushalayim for the Mitzvah of Matzah.
2. Rebbi Akiva explains why Matzah is called "Lechem Oni."
3. The Gemara explains why lukewarm water may be used for flour offerings but not for Matzah.
4. A Kohen is obligated to perform the flour offering service only from the act of Kemitzah and onward.
5. Even Rebbi Akiva (see above, #1) agrees that one may not fulfill the Mitzvah of Matzah with Matzah made from wheat of Bikurim.
A BIT MORE
1. Rebbi Yosi ha'Glili: One may not use it, because Ma'aser Sheni is not "Lechem Oni," but rather it is eaten in joy. Rebbi Akiva and the Mishnah: One may use Ma'aser Sheni, because "Lechem Oni" describes only the physical characteristics of the Matzah, and thus excludes Matzah made with honey, wine, or oil.
2. "Lechem Oni" implies that the Matzah may not be made with fruit juice. It also implies that the Matzah should be present and in view when we recite Hallel and the Hagadah ("Lechem she'Onin Alav Devarim Harbeh").
3. This is because Kohanim, who are responsible for preparing the flour offerings, are very careful not to allow them to become Chametz, whereas ordinary people who bake Matzos are not as careful.
4. The pouring and mixing of the oil may be done by a non-Kohen. The Gemara explains that although Kohanim do not necessarily make the flour offerings, the offerings are made in a place where there are many Kohanim who ensure that the non-Kohanim are careful with the offerings.
5. This is because the verse states, "In all of your areas of dwelling you shall eat Matzos," implying that Matzah must be made of wheat that may be eaten anywhere, whereas wheat of Bikurim may be eaten only in Yerushalayim. (The Gemara explains that Rebbi Akiva derives from a verse that Matzah may be made from wheat of Ma'aser Sheni, even though it may be eaten only in Yerushalayim.)
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