REVACH L'DAF
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SUMMARY
A Metzora must shave his entire body, including his head, despite of the prohibition against shaving the Pe'os, because the Mitzvas Aseh supersedes the Lo Sa'aseh. (1)
The prohibition against shaving the Pe'os is a Lo Sa'aseh which does not apply to everyone. (2)
A Kohen Metzora must shave his entire body, including his beard, despite the prohibition against shaving the beard with a razor, because the Aseh supersedes the Lo Sa'aseh. (3)
Prohibitions that apply to Kohanim are more stringent, since the Torah gave the Kohanim extra Mitzvos.
A Metzora who is also a Nazir must shave his entire body, including his head, despite of the prohibition against shaving the Pe'os, because the Aseh supersedes the Lo Sa'aseh.
A Nazir may annul his vow by means of going to a Chacham and expressing regret that he vowed to be a Nazir. (4)
The prohibition for a Nazir to cut his hair includes both a Mitzvas Aseh and a Mitzvas Lo Sa'aseh.
From the word "Gedilim" our Sages learn that four strands of Tzitzis are required on each corner of the garment. (5)
The prohibition of Sha'atnez applies only when the wool and linen are secured together with at least two stitches.
Sha'atnez is forbidden only when the material is combed, spun, and twisted.
The Mitzvos Aseh of Milah, Pesach, and the Korban Tamid supersede the Lo Sa'aseh against doing Melachah on Shabbos, even though the Lo Sa'aseh of Shabbos is punishable with Kares. (6)
The Mitzvah of honoring one's parents does not supersede the Mitzvah of Shabbos, because the parents are also obligated to honor Hashem.
A BIT MORE
1. Even though the Metzora is shaving his entire head and not just his Pe'os, it is still included in the prohibition against shaving the Pe'os.
2. Therefore, even though the Torah teaches that an Aseh supersedes the Lo Sa'aseh of shaving the Pe'os, we cannot derive from here that an Aseh supersedes a Lo Sa'aseh that does apply to everyone.
3. Even though the prohibition against shaving the beard is a Lo Sa'aseh that applies only to the Kohanim, now that we have two sources that an Aseh supersedes a Lo Sa'aseh that does not apply to everyone, we derive that in all cases an Aseh supersedes a Lo Sa'aseh.
4. For that reason, the Lo Sa'aseh that applies to a Nazir is of lesser stringency. Therefore, the Aseh supersedes the Lo Sa'aseh of a Nazir, and we may not derive from a Nazir that in general an Aseh supersedes a Lo Sa'aseh.
5. The four strands are doubled over to make them eight.
6. Although, normally, an Aseh does not supersede a Lo Sa'aseh punishable with Kares, these three Mitzvos are different because of the exceptional nature of these Mitzvos. Milah and Pesach are the only two Mitzvos Aseh that are punishable with Kares. Pesach and Tamid are Korbanos that are brought on the Mizbe'ach. All three of these Mitzvos existed prior to Matan Torah, according to the opinion that the Olah that was brought by Yisrael in the Midbar was a Korban Tamid.
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BRIEF INSIGHT
IS NAZIR A LO SA'ASEH THAT APPLIES TO EVERYONE
Rashi says that the Lo Sa'aseh that applies to a Nazir is of lesser stringency because it is regarded as a Lo Sa'aseh that does not apply to everyone. Even though the Lo Sa'aseh of Nazir does not apply to everyone, we still may derive from Nazir that an Aseh supersedes a Lo Sa'aseh because we already know from the verse of Metzora that an Aseh supersedes a Lo Sa'aseh that does not apply to everyone. Thus, the verse of Nazir is extra, and the purpose of the verse is to teach that in all cases an Aseh supersedes a Lo Sa'aseh. The Maharshal asks, why, then, does the Gemara say that Nazir is not an appropriate source that an Aseh supersedes a Lo Sa'aseh because a Nazir may annul his vow? It is irrelevant that a Nazir may annul his vow! Since the verse is extra we still may use Nazir as the source that in all cases an Aseh supersedes a Lo Sa'aseh! Additionally, the Maharsha asks that the Gemara in Maseches Nazir explicitly says that the Lo Sa'aseh of Nazir is regarded as a Lo Sa'aseh that does apply to everyone. Also, why should a Nazir not be regarded as a Lo Sa'aseh that does apply to everyone, considering that both men and women may become a Nazir? Therefore, both the Maharsha and Maharam conclude that this comment of Rashi is not genuine, but was inserted later, and Rashi never said that a Nazir is a Lo Sa'aseh that does not apply to everyone.
QUICK HALACHAH
WHEN IS A MIXTURE OF WOOL AND LINEN CONSIDEREDKIL'AYIM
A woolen garment that was fastened to a linen garment with only one stitch is not regarded as attached and is not Kil'ayim. If both ends of the thread are inserted at once, or if they are fastened with two stitches, it is regarded as Kil'ayim. Some opinions say that it is not Kil'ayim unless knots were made at both ends of the thread. (Shulchan Aruch YD 300:2)
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