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(יט) אֶֽת־חֻקֹּתַי֮ תִּשְׁמֹרוּ֒ בְּהֶמְתְּךָ֙ לֹא־תַרְבִּ֣יעַ כִּלְאַ֔יִם שָׂדְךָ֖ לֹא־תִזְרַ֣ע כִּלְאָ֑יִם וּבֶ֤גֶד כִּלְאַ֙יִם֙ שַֽׁעַטְנֵ֔ז לֹ֥א יַעֲלֶ֖ה עָלֶֽיךָ׃ (פ)

Leviticus 19:19

(19) You shall observe My laws. You shall not let your cattle mate with a different kind; you shall not sow your field with two kinds of seed; you shall not put on cloth from a mixture of two kinds of material.

יבמות ה׳ ב:ג׳

א"כ לימא קרא לא תלבש שעטנז צמר ופשתים יחדו ל"ל ש"מ לאפנויי

Yevamot 5b:3

The Gemara responds: If so, that this phrase is not extraneous at all, and therefore it cannot be used as a homiletical interpretation by the juxtaposition of verses, let the verse say merely: You shall not wear diverse kinds [sha’atnez]. Why do I need the verse to add the phrase “wool and linen together”? Conclude from this that this phrase is free, and a homiletical interpretation can be derived from the juxtaposition of verses.

יבמות ה׳ ב:ד׳

ואכתי מיבעי ליה לתוכף שתי תכיפות חיבור ותכיפה אחת אינו חיבור א"כ לכתוב רחמנא לא תלבש צמר ופשתים יחדו שעטנז ל"ל ש"מ לאפנויי

Yevamot 5b:4

The Gemara raises a further difficulty: And still, it is necessary for the verse to state “wool and linen together” to teach another halakha concerning diverse kinds: When one combines a woolen garment with a linen garment, if he stitches two stitches with a needle, this is considered attachment, but a single stitch is not attachment. This halakha is derived from the term “together,” which indicates that they are attached as one. The Gemara answers: If so, let the Merciful One write: You shall not wear wool and linen together. Why do I need the verse to add the phrase “diverse kinds”? Conclude from this that this phrase is free.

רש"י על יבמות ה׳ ב:ד׳:א׳

תכיפה - פויינ"ט שתוחב תחיבה אחת במחט וחיבר כלאים בגד צמר ובגד פשתים יחד אינו חיבור בפחות משתי תכיפות להכי כתיב יחדיו עד שיחברם יחד יפה:

Rashi on Yevamot 5b:4:1

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נדה ס״א ב:ג׳

ת"ר בגד שאבד בו כלאים הרי זה לא ימכרנו לעובד כוכבים ולא יעשנו מרדעת לחמור אבל עושה ממנו תכריכין למת אמר רב יוסף זאת אומרת מצות בטלות לעתיד לבא

Niddah 61b:3

The Gemara cites another case of a garment in which something was lost. The Sages taught in a baraita: With regard to a garment in which diverse kinds, a prohibited mixture of wool and linen, was lost, i.e., it is a wool garment into which a linen thread was sewn or vice versa and it is not known where on the garment the thread is located, one may not sell it to a gentile and one may not even fashion it into a saddlecloth for a donkey. This is prohibited lest one remove a piece of the garment and sew it onto his own clothing. But one may fashion it into a shroud for a corpse, as there is no concern that one might remove it from the dead. Rav Yosef said: That is to say that the mitzvot will be nullified in the future. If this were not the case, then when the dead are resurrected they will be deriving benefit from the garment of diverse kinds in which they were buried.