Reference for Chullin 106:34

אמר רב יוסף הא דבני ר' חייא כבר פירשה שמואל דאמר שמואל משום ר' חנינא בן אנטיגנוס

R'Nahman said: In the case of a thorn [the animal is not trefah] unless it penetrated into the [abdominal] cavity;<span class="x" onmousemove="('comment',' If, however, the thorn penetrated into the abdominal cavity the animal is trefah, and no examination of the internal organs will be of avail; for a perforation of the intestines would not be noticeable even on examination.');">¹¹</span>

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