Reference for Chullin 106:23
וליזבנינהו לעובדי כוכבים
The sons of R'Hiyya said: The examination of which the Rabbis have spoken in the case of 'clawing',<span class="x" onmousemove="('comment',' Where there was a doubt about an animal whether it had been clawed or not (or, according to Tosaf., even if it was certain that the animal was clawed) , it must be examined for any red spots, for these indicate the presence of poison injected into the flesh by the claw.');"><sup>7</sup></span>
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