Commentary for Yevamot 8:13

והא תנא דבי רבי ישמעאל לית ליה דרבא

is flax, purple must be wool.<span class="x" onmousemove="('comment',' As the garments were either of wool or flax, and linen (flax) was specified in the case of one, all the others must have been wool. Now since it has been shewn that purple is wool, it obviously follows that woollen zizith or fringes are permissible in a garment of flax. What was the need, then, for a specific text to prove the permissibility of mingling wool and flax in zizith? ');">³⁵</span> — [The text] was necessary; for it might have been assumed [that the interpretation is] according to Raba. For Raba pointed out a contradiction: It is written, the corner,<span class="x" onmousemove="('comment',' Num. XV, 38. ');">³⁶</span> [which implies that the fringes must be of the same] kind of [material as that of the] corner,<span class="x" onmousemove="('comment',' I.e., if the material of the corner is wool the fringes must be wool; if of flax the fringes must be of flax. ');">³⁷</span>

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