| Sifting as one of the 39 Melachot is
defined as separating the unwanted portions
from food by means of a sieve, and
it includes both the sifting of flour
and the straining of liquids.
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Most of this information is taken
from the book "SABBATH Day of Eternity"
by Rabbi Aryeh Kaplan, published by NCSY.
In the book itself, there are notes that refer the
reader to detailed footnotes.
I am lucky to have found such a clear, concise manual
with these brief overviews of laws so vast and complex
there are Rabbis that specialize in them.
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