Reference for Eruvin 192:12

אמר רבא וכי אדם טורח לעשות קמיע כמין תפילין דתנן במה דברים אמורים בישנות אבל בחדשות פטור

R'Eleazar said: If a man found blue wool in the street, and it was in the shape of straps.<span class="x" onmousemove="('comment',' Combed and dyed; since it is possible that the dyeing was not done with the intention, and for the purpose of using the wool for zizith (v. Glos.) . The threads for the zizith must be spun and dyed for the purpose of using them in the fulfilment of the commandment.');">²³</span> it is unfit<span class="x" onmousemove="('comment',' For zizith.');">²⁴</span> but if it was in the shape of threads it is fit.

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