Reference for Chullin 79:12
איתיביה רב נחמן לרב הונא
R'Huna stated: If his neighbour's beast was lying in front of an idol, then as soon as he has cut one of th organs of the throat he has thereby rendered it prohibited.<span class="x" onmousemove="('comment',' The principle is that a person cannot render prohibited that which belongs to another merely by word of mouth but only by an act. It goes without saying that a man's own beast would be prohibited by this act.');"><sup>6</sup></span>
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