Reference for Niddah 122:27

וכיון דלא ידע אי נתקיה שרי

the prohibition does not apply unless the material was hackled, spun and woven,<span class="x" onmousemove="('comment',' Shu'a, tawui and nuz, three words Rabbinically assumed to make up the word sha'atnez. ');">²³</span>

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