[Avodah] Techeiles and Shaatnez deOraisa

[Micha Berger]

A maqor for asei dokheh lav is the fact that shaatnez and tzitzis are
juxtaposed when each are repeated in Devarim (22:11-12). (Yevamos 5a-b)

"Dawidh Yoseph Aguirre" asked about this last night on the Techeiles
Facebook group.

Later on the same amud, we learn that the reason why the pasuq says both
"shaatnez" and "tzemer ufishtim yachdav" is because the former limits
the issur deOraisa to when the fibers are "shua tavui vanuz - combed
spun and connected" together.

Tosafos (d"h "ad sheyehei...") note that with their shitah that tekheiles
is two full strings (4 ends) per corner, tzitzis wouldn't violate shaatnez
deOraisa, and thus no need for asei dokheh lav.

Rabbeinu Tam concludes that the "va-" is or -- the issur deOraisa is
when the threads are combed OR spun OR connected together.

RDYA's question is with Rashi.

Rashi also holds the strings are 2:2. And he takes "va-" to mean "and"
in (see
d"h "shua tavui vanuz". And in Niddah 61b, where the same expansion of
the word "shaatznez" appears, Rashi ("vanuz") makes a point of saying that 
nuz alone is only derabbanan.

Rashi also holds the strings are 2:2.

The Rambam has 1:7, which mean that there actually is a string that is
half laven and half tekheiles, and therefore making Rambam tekheiles
strings where the lavan is linen actually could involve
"shua tavui vanuz".

So the question is, how do we explain Rashi?

Raavad - 1:3. Same problem, there is no thread that would be combed and
spun from both lavan linen and tekheiles (which by definition is wool).

And.... isn't pashut peshat in the gemara a raayah for the Rambam?

Tir'u baTov!
-Micha

-- 
Micha Berger                 Man is capable of changing the world for the
http://www.aishdas.org/asp   better if possible, and of changing himself for
Author: Widen Your Tent      the better if necessary.
- https://amzn.to/2JRxnDF          - Victor Frankl, Man's search for Meaning