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I heard two people learning about Issur Kolel and Issur Moisif. They kept talking about the Rambam's Nekudah Niflaah. What is it?

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Check out the bottom of this page, quoting the Pirush Hamishnayot LeHaRambam to Kerisus 3:4 -- shemayisrael.co.il/dafyomi2/chulin/insites/ch-dt-113.htm – Menachem Sep 15 '11 at 4:04
Menachem great find put it as an answer so i can give you the credit – Chalutzhanal Sep 15 '11 at 4:38
vbm-torah.org/archive/kashrut/26basarbechalav.rtf for an application in basar b'chalav. – JXG Sep 15 '11 at 6:36
up vote 4 down vote accepted

from here:

The RAMBAM (Perush ha'Mishnayos to Kerisus 3:4) explains that when the Torah prohibits eating meat with milk, and benefiting from a mixture of meat and milk, it uses the same phrase, "Lo Tevashel." The use of the same word teaches that when the Isur of Achilah does not apply, the Isur of Hana'ah also does not apply. With regard to a mixture of Neveilah with milk, if the prohibition to eat meat and milk does not take effect because "Ein Isur Chal Al Isur" (since the mixture is already prohibited to be eaten because of the Isur of Neveilah), then the Isur of Hana'ah also does not take effect, and thus it cannot be an "Isur Mosif"! (The Rambam refers to this explanation as a "Nekudah Nifla'ah" -- a "wonderful point.")

A link to the Perush ha'Mishnayos inside.

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Ergo, according to Rambam, if you take common non-kosher beef (that wasn't kosher-slaughtered) and then cook it in milk, you're still allowed to benefit from it -- e.g. feed it to your pet. Most Achronim don't follow the Rambam, with exception of Dagul Mervava (Rabbi Yechezkel Landau of Prague, aka Noda Bihuda) – Shalom Sep 15 '11 at 21:21

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