Reference for Chullin 239:9
חלחולי מחלחל
But 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 amongst other hairs.
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Talmud Bavli
חלחולי מחלחל
But 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 amongst other hairs.