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If a Hedyot does Meshichah on Hekdesh that is worth 100 and before he gives the money it goes up to 200 he must give 200. (1)
If a Hedyot does Meshichah on Hekdesh that is worth 200 and before he gives the money it goes down to 100 he must give 200. (2)
If a Hedyot redeems Hekdesh for 200 and before he does Meshichah it goes down to 100 he must give 200
If a Hedyot redeems Hekdesh for 100 and before he does Meshichah it goes up to 200, he only gives 100. (3)
The obligations that a parent has to the sons apply only to the father not the mother.
Women are obligated in all Mitzvas Aseh that are not time bound and in all Mitzvos Lo Sa'aseh, with the exception of Bal Takif, Bal Tashchis and Bal Titamei l'Mesim. (4)
Both a man and a woman are obligated to honor and fear their parents.
A father is obligated to give his son a Bris Milah, to redeem him, to teach him Torah, marry him off, and teach him a vocation. (5)
Rebbi Yehudah says that if a father does not teach his son a vocation it is as if he is teaching him to be a thief.
If a father fails to give his son a Bris Milah the Beis Din is obligated to do so and if the Beis Din fails to do so the obligation falls on the child himself.
If the father fails to redeem his first born the child is obligated to redeem himself.
The Mitzvah of Pidyon does not apply to a firstborn girl at all.
If a father of a first born son had not yet been redeemed himself and he only has five Sela'im he should redeem himself before redeeming his son. (6)
If the father has five Sela'im plus another five Sela'im of Meshu'abadim, Rebbi Yehudah says he should redeem his son with his five Sela'im because the five Sela'im of Meshu'abadim may be used for his own Pidyon. (7)
The Rabanan hold that he should redeem himself with the five Sela'im because the five Sela'im of Meshu'abadim may not be used even for his own Pidyon and his own Pidyon takes precedence. (8)
If a father of a firstborn son only has five Sela'im and he has no other money for Aliyah l'Regel, he should redeem his son instead of using the money to be Oleh Regel.
Rebbi Yehudah says that he should use the money to be Oleh Regel because it is a Mitzvah Overes (the opportunity will soon pass).
If a man has five first born sons from five women he must redeem all of them.
A firstborn of the father is regarded as a Bechor for inheritance, not a firstborn of the mother.
If a father fails to teach his son Torah the son is obligated to teach himself.
The Mitzvah of learning or teaching Torah does not apply to a woman at all.
The Mitzvah to learn Torah takes precedence over teaching Torah to a son; Rebbi Yehudah says that if the son is more successful in his learning the son takes precedence.
A person shall learn Torah before marrying, however if one feels that it is necessary for him to marry he shall marry first and than learn Torah.
R. Huna says that if someone reaches 20 years old without marrying he will be plagued by Hirhurim his entire life.
A BIT MORE
1. Because the Kinyanim of Hekdesh is with Kesef, not Meshichah.
2. Even though the Kinyanim of Hekdesh is with Kesef not Meshichah, however Hekdesh may not be worst than Hedyot and if it belonged to a Hedyot he may not back out once he did Meshichah.
3. Even though there is a Sevara that Hekdesh may not be worst than Hedyot, however even a Hedyot may not back out l'Chatchilah once money changed hands and if he back out he is cursed with a Mi she'Parah.
4. Kohanim may not be Mitamei to Mesim other than close relatives; however the wives and daughters of Kohanim are not included in this Mitzvas Lo Sa'aseh.
5. According to one opinion the father must also teach his son how to swim.
6. Because redeeming himself is a Mitzvah on his own body and it takes precedence
7. According to Rebbi Yehudah a Chov that is written in the Torah (such as the Chiyuv of Pidyon ha'Ben) is the same as if it was written in a Shtar and therefore it may be collected from Meshu'abadim. However only his Pidyon may be collected from Meshu'abadim because the Chov from his own Pidyon predates the sale of the property, but the Pidyon of his son occurred after the sale of the property and therefore may not be collected from the Meshu'abadim. Consequently Rebbi Yehudah holds that the five Sela'im that he has shall be used for the Pidyon of the son while the five Sela'im of Meshu'abadim shall be used for his own Pidyon.
8. The Chachamim hold that a Chov that is written in the Torah (such as the Chiyuv of Pidyon ha'Ben) is not the same as if it was written in a Shtar and therefore the Pidyon may not be collected from Meshu'abadim. Since he only has five Sela'im available for the Pidyon he should redeem himself with that money because his own Pidyon takes precedence to the Pidyon of his son.
AN AMAZING MIRACLE
Abaye sent R. Acha Bar Yakov into the Beis ha'Midrash where there was a Mazik because he said maybe a miracle will occur because R. Acha Bar Yakov is a big Tzadik. Why did Abaye send R. Acha Bar Yakov into a dangerous situation with the hope that a miracle will happen? The Chochmas Shlomo says that Abaye was certain that a miracle would occur since R. Acha Bar Yakov was such a great Tzadik; his only Safek was whether it will be a hidden miracle or an open miracle. The Maharsha says that the Safek of Abaye was whether the miracle will occur prior to the Tefilah of R. Acha Bar Yakov and in that case the miracle will be subtracted from his merits or if the miracle will happen after his Tefilah and since the miracle is due to his Tefilah his merits will not be subtracted.
Both men and women are equally obligated in the Mitzvah of Kavod and Mora of the father and mother, however a woman does not have it in her hands to fulfill the Mitzvah because she is Meshu'abad to her husband. Therefore a married woman is Patur from this Mitzvah. If the woman is widowed or divorced she is again obligated in the Mitzvah. (Shulchan Aruch YD 240:17)
If her husband is not Makpid a married woman is Chayav in the Mitzvah of Kibud Av va'Em. (Shach)
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