Commentary for Menachot 80:9
ומי אמרינן תעשה ולא מן העשוי (איני) והאמר ר' זירא הטיל למוטלת כשרה
as soon as three fingerbreadths of the garment had been woven!<span class="x" onmousemove="('comment',' As soon as a strip three fingers wide (the minimum size of a garment) had been woven they used to insert two fringes, one at each corner, and the other two fringes they inserted when the cloth was finished. Now it is clear that the obligation of fringes falls due only when the weaving is finished, nevertheless, it is taught here, that the first two fringes are deemed valid and are not regarded as ready made.');"><sup>14</sup></span> - Render: they used to insert the fringes as soon as the last three fingerbreadths had been reached.
Tosafot on Menachot
But doesn’t Rabbi Zeira say, "If one affixed [tsitsit] to a garment that already had them affixed, it is fit": It is a wonder: How might you think that Rabbi Zeira does not hold of, "Prepare [it], and not from what has already been prepared." Behold, Rabbi Zeira himself holds from it above! And it can be said (the answer is) that you might have thought that since the beginning of its placement was for the sake of the commandment, "Prepare it, and not from what has already been prepared," does not apply. But above, when it was cut, the [status of the] placement was nullified.
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