Midrash for Chullin 99:27

מכאן ואילך אפילו בא ממקום קרוב מונה לעצמו

R'Shimi B'Hiyya said: We may compare defects in the intestines.<span class="x" onmousemove="('comment',' I.e., we may compare a perforation found in the intestines concerning which there is a doubt whether it existed before the slaughtering, in which case the animal would be trefah, or it was made after the slaughtering, in which case it is permitted, with a perforation made in that same organ after the slaughtering. If the two perforations are alike in appearance the animal is permitted, for it is clear that they both were made after the slaughtering.');">¹²</span>

Sifrei Devarim