申命記 22:11 註釋：Rashi, Rabbeinu Bahya, Chizkuni & Tur HaArokh

שעטנז is an expression for a mixture. Our Rabbis explained it to mean a material that is calendered (pressed, שוע), or woven (טווי), or twisted (נוז) together (Sifrei Devarim 232:1); (שעטנז is taken to be an abbreviation of these words; cf. Rashi on Leviticus 19:19 and our Note thereon).

.לא תלבש שעטנז צמר ופשתים יחדו , “Do not wear a mixture, i.e. wool and linen together.” The Torah forbids this mixture only when woven together or sewn together. This is the meaning of יחדו. It is perfectly in order, however, to wear a linen shirt underneath a woolen jacket (Maimonides Hilchot Kilayim 10,11). It is also permitted to sew together the skins of animals producing wool with linen threads, seeing that this does not constitute a garment. We discussed the mystical aspects of this commandment in Leviticus 19,19.

צמר ופשתים יחדו, “wool and linen together.” The reason why only these two categories of yarns are forbidden to be mixed is that the two were involved in the first murder. Kayin’s offering to G-d had consisted of leftover flax that he had grown, while Hevel had offered sheep which grow wool. Seeing that these two species had been indirectly responsible for the first disagreement between two human beings ending in the death of one, we are to be forever mindful of this. An alternate interpretation: These two fibers were used in the garments worn by the priests when performing service in the Temple but are not permitted to be worn by the priests at any other times. This is why the affliction known as tzoraat, does not strike garments consisting of any other fibers. This is a reminder that there is a basic problem involving these fibers, one that is overcome only on holy consecrated ground when used by the priests in their service to G-d. The Torah teaches that the expression shatnes, means a mixture of woolen and flax (linen) fibers.