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Rebbi Meir says that if someone makes a Neder not to eat Dagan he may not eat dry Pul ha'Mitzri, but he is permitted to eat fruit and vegetables. (1)
The Chachamim hold that a Neder not to eat Dagan only includes the five types of Tevu'ah.
If someone makes a Neder not to eat Tevu'ah he may not the five types of Tevu'ah.
The word Alalta includes all profitable items.
If a person makes himself Hefker like a desert the Torah is given to him as a gift.
If a person lifts himself up Hashem Yisbarach lowers him and sinks him into the ground. (2)
If someone makes a Neder not to eat Peiros ha'Shanah he may eat goats, lambs, milk and chicks. (3)
If someone makes a Neder not to eat Peiros ha'Aretz he may not eat mushrooms and fungi. (4)
The blessing on salt, mushrooms and fungi is sheha'Kol. (5)
If someone makes a Neder not to wear clothing he may wear sackcloth, but he may not wear leather garments. (6)
If he says Konam Pishtan Olah Alai he may wear strips of flax.
A person may wear sackcloth on Shabbos to protect himself from rain but he may not wear a box or a mat.
Rebbi Yehudah says that if someone was wearing wool and it was uncomfortable and he says Konam Tzemer Olah Alai he may not wear wool, but he may carry wool. (7)
A BIT MORE
1. He also may eat rice and chopped wheat.
2. If he repents Hashem will pick him back up.
3. If he says Gidulei Shanah Alai all of these things are forbidden.
4. If he says Gidulei Karka Alai all of these things are forbidden.
5. Even though they grow from the ground they receive their nourishment from the air.
6. If he says Konam Tzemer Olah Alai he may wear wool shearings.
7. If he was carrying flax and was sweating and he says Konam Pishtan Olah Alai he may not carry flax but he may wear it.
MODESTY AND TORAH
If a person makes himself Hefker like a desert the Torah is given to him as a gift. A person who makes himself Hefker is a modest and self effacing person and those are the Midos necessary for the acquisition of Torah. Moshe Rabeinu was the most modest person on earth and that is why he merited to receive the Torah. Immodesty and arrogance are the opposite of the Torah and a person with these characteristics cannot become a Ben Torah. (Maharal)
BLESSINGS ON FOOD
The blessing of sheha'Kol is recited on food items that grow from the ground such as meat, fish, eggs ,milk and cheese. The blessing of sheha'Kol is also recited on moldy bread, a spoiled dish, sun burned dates, grasshoppers, salt, saltwater, soup, fungi and mushrooms. (Shulchan Aruch OC 204:1)
On all of these things the after blessing of Bore Nefashos is recited. (Bi'ur Halachah)
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