Reference for Chullin 141:35

נהי דלא חזיא בפניו שלא בפניו מיחזיא חזיא ליה

But according to Bar Padda who says, [It is nebelah] for conveying the graver uncleanness until [it becomes unfit] for a stranger, and for conveying the lighter uncleanness until [it becomes unfit] for a dog, the reason might well be that it is no longer fit for a stranger!<span class="x" onmousemove="('comment',' So that what this man has eaten is no longer accounted as nebelah and that is the reason why he is not rendered unclean immediately after sunset, but not because it is unclean matter that has been swallowed.');">²³</span>

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