Reference for Yoma 133:12
מאן דאמר מותרין
HE DIVIDED THE THREAD OF CRIMSON WOOL: But let him tie the whole [thread] to the rock? - Since it is his duty [to complete his work with] the he-goat, perhaps the thread might become fast white, and he would be satisfied.<span class="x" onmousemove="('comment',' If the thread should turn white suddenly before the goat had yet been hurled down, the appointed man might be so happy with the sign of forgiveness obtained as to neglect going through with the prescribed ceremony of pushing the he-goat downward, thus leaving the command unfulfilled.');"><sup>12</sup></span> But let him tie the whole thread between its horns? - At times its head [in falling] is bent and he would not pay attention.<span class="x" onmousemove="('comment',' To the change in colour, since the thread would be out of his sight.');"><sup>13</sup></span> Our Rabbis taught:<span class="x" onmousemove="('comment',' V. R.H. 31b.');"><sup>14</sup></span> In the beginning they would tie the thread of crimson wool on the entrance of the Ulam<span class="x" onmousemove="('comment',' The Hall leading to the interior of the Temple.');"><sup>15</sup></span> without: if it became white they rejoiced; if it did not become white, they were sad and ashamed. Thereupon they arranged to tie it to the entrance of the Ulam within. But they were still peeping through and if it became white, they rejoiced, whereas, if it did not become white, they grew sad and ashamed. Thereupon they arranged to tie one half to the rock and the other half between its horns. R'Nahum B'Papa said in the name of R'Eleazar ha-Kappar: Originally they used to tie the thread of crimson wool to the entrance of the Ulam within, and as soon as the he-goat reached the wilderness, it turned white. Then they knew that the commandment concerning it had been fulfilled, as it is said: If your sins be as scarlet, they shall be as white wool.<span class="x" onmousemove="('comment',' Isa. I, 18.');"><sup>16</sup></span> BEFORE IT HAD REACHED HALF ITS WAY DOWN HILL: The question was raised: As to those limbs [pieces] are they permitted for general use?<span class="x" onmousemove="('comment',' I.e., may they e.g., be sold so that the profit therefrom be enjoyed. Hana'ah (general use) stands for any enjoyment except akilah, eating for human consumption, therefore using it for profit, as a gift, etc.');"><sup>17</sup></span> Rab and Samuel are in dispute on this point, one saying: They are permitted, the other they are forbidden. The one who holds they are permitted [argues thus]: