Reference for Chullin 238:40

בנימא שבין הנימין והיכא אתמר דר' אלעא

Another version renders the argument as follows: It is more reasonable to say that it [a hair] is regarded a a protection, for should you say it is regarded as a handle [it will be asked]: Of what use is one hair? - As R'Ila'a referred [elsewhere] to a bristle among many bristles, so here, too, it refers to a hair among hairs.

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