Midrash for Chullin 141:37
קל וחומר
We have thus learnt that an unclean object that has been swallowed [cannot render unclean]; whence do we learn that a clean object that has been swallowed [cannot be rendered unclean]? - By an a fortiori argument.
Sifrei Devarim
(Devarim 14:4) "This is the beast that you may eat: the ox, the lamb of sheep, and the kid of goats, the hart, the gazelle, and the fallow deer" — whence we derive that animals (the last three) are in the category of "beast."
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