Reference for Bekhorot 49:56

צמר המסובך באוזן ר' יוסי בן המשולם אומר

<big><b>MISHNAH: </b></big>IF [A PORTION OF] THE HAIR OF A BLEMISHED FIRSTLING WAS TORN AWAY AND HE PLACED IT IN THE WINDOW,<span class="x" onmousemove="('comment',' As the hair i.e., the wool, is forbidden to be used while the animal is alive, because it is the wool of an animal disqualified for the altar.');">³²</span>

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