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  1. Separating the chaff from the grain using the force of wind is the Melacha of Zoreah (winnowing). [1] This Melacha also includes separating any undesired matter from a food by use of wind. [2]
  2. Separating undesired matter from food by use of artifical wind is also Zoreah. Thus, one may not blow on a mixture of peanuts and their thin outer shells to remove the shells. [3]
  3. One should not blow against the wind causing the saliva to become mist. [4]


  1. 39 Melachos (Rabbi Ribiat, vol 2, pg 373) quoting Rabbenu Chananel Shabbat 74a and Rashi 73a D"H Zoreah and 73b D"H Haynu.
  2. 39 Melachos (Rabbi Ribiat, vol 2, pg 374) quoting Iglei Tal Zoreah 4
  3. 39 Melachos (Rabbi Ribiat, vol 2, pg 374)
  4. Rama 319:17, 39 Melachos (vol 2, pg 375)