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1. There is a dispute about whether Sechach may be made only from the same species as the Arba'as ha'Minim.
2. The Gemara discusses the verse in Ezra that instructs the people to bring "olive, oil, myrtle, and date leaves" for their Sukah.
3. There is a dispute about whether one must tie the Arba'as ha'Minim together with a piece of Lulav.
4. There is a dispute about whether one fulfills the Mitzvah if he picks up the Arba'as ha'Minim using a cloth.
5. One may not enjoy the smell of the Hadas branch used for the Arba'as ha'Minim, but one may enjoy the smell of the Esrog used for the Arba'as ha'Minim.
A BIT MORE
1. Rebbi Meir: Sechach may be made from anything that grows from the ground and does not become Tamei. Rebbi Yehudah: Sechach must be made only from the same species as the Arba'as ha'Minim (Lulav, Esrog, Hadas, and Aravah trees).
2. According to Rebbi Meir, this verse is proof that one may use anything that grows from the ground for Sechach as long as it cannot become Tamei. Rebbi Yehudah understands that the instruction was to bring olive and oil wood for walls, and to bring myrtle, date leaves and branches for Sechach.
3. Rebbi Meir: The important people in Yerushalayim used gold thread to tie their Arba'as ha'Minim together. Chachamim: Those people also used pieces of Lulav to tie together their Arba'as ha'Minim, and, therefore, there is no proof that one may use gold thread (or something other than Lulav) alone.
4. Rabah: This is not a valid way to perform the Mitzvah, since it is not called a "complete taking." Rava: Picking something up while not touching it directly (but using another item to hold it) is considered taking it and a valid fulfillment of the Mitzvah.
5. This is because a Hadas branch is usually used for its smell. Therefore, dedicating it to be used for the Arba'as ha'Minim precludes its use for smelling it and getting mundane benefit from it. In contrast, an Esrog is usually eaten and not smelled. Hence, when it is dedicated for use for the Arba'as ha'Minim, eating it becomes prohibited, but smelling it is permitted.
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