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R' Alfasi's laws of Niddah are actually hidden in the second chapter of tractate Shevuos. If you don't have a printed tractate handy, then see pages 767 through 778 of's Sanhedrin-Makkos-Shevuos PDF. As a courtesy to the reader ש”ס נהרדעא also includes a second copy of R' Alfasi's laws of Niddah inside tractate Niddah. This second copy is ...


At, I have translated the Rif (into English) for the following masechtot: bava batra bava kamma beitza brachot chagiga eruvin gittin ketubot kiddushin megillah moed katan nedarim niddah pesachim rosh hashana shabbat succah taanit yevamot yoma


It is not all in Shavout, there is some in Yevamot. I think the reason is because there is only about one or two perakim that are הלכה למעשה (like הרואה כתם) in Niddah, so the Rif wrote down the halachos thereof on masechtos that he was writing on anyway that have sugyas about Niddah, like the end of the second perek of Shavuot.


To my surprise, it turns out that neither the Rif nor the Rosh ever penned commentaries to those two masekhtas. According to the Jewish Encyclopedia articles ("Alfasi, Isaac ben Jacob" and "Asher ben Jehiel", respectively), the Rif's Sefer haHalakhot covers only Berakhot, Shabbat, Eruvin, Pesachim, Ta'anit, Beitzah, Rosh haShana, Yoma, Sukkah, Megillah, Mo'...


The Rif has written his Halochos from Yerushalmi as well as Bavli and there is a Rashi commentary on that (in the Rif) e.g. see Berachos 8b (Rif pages) on the last of the narrow lines where he quotes the Yerushalmi and Rashi has a commentary on it - so for sure it's not exactly copied-and-pasted from the Gemara, in fact there are times that the Poskim quote ...

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