Reference for Menachot 78:13

ורב נחמן כדתנא דבי רבי ישמעאל

by the law of the Torah then that is why diverse kinds are permitted for them; but if you say that it<span class="x" onmousemove="('comment',' That silk garments must be provided with zizith.');">¹⁴</span> is merely a Rabbinic enactment, how can it be that diverse kinds are permitted for them? - Render, either woollen threads or linen threads.<span class="x" onmousemove="('comment',' But the two kinds together would not be permitted to be used as fringes in a silk garment.');">¹⁵</span>

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