Talmud for Menachot 84:5
א"ל רב מרדכי לרב אשי אתון הכי מתניתו לה
although it may be made by a gentile, when an Israelite makes it he does not pronounce a blessing. And as regards the zizith they differ<span class="x" onmousemove="('comment',' R. Nahman and R. Hisda as to whether one must pronounce a blessing when making the fringes.');"><sup>6</sup></span> in this: One holds that [the law of zizith] is an obligation resting upon the garment,<span class="x" onmousemove="('comment',' This is R. Hisda's view, and therefore as soon as the fringes are inserted in the garment that is the completion of the precept, so that it is necessary to make a blessing at the time.');"><sup>7</sup></span>
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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