Talmud 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.');"><sup>23</sup></span> it is unfit<span class="x" onmousemove="('comment',' For zizith.');"><sup>24</sup></span> but if it was in the shape of threads it is fit.
Tractate Tzitzit
If one finds blue [threads], even though they are twined,30As zizith are. they are invalid, since the blue [for zizith] may be bought only from a reliable person.31Or, ‘expert’, who knows that only ḥillazon blue may be used.
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