Reference for Bava Batra 187:11

מיתיבי כל סאה שיש בה רובע ממין אחר ימעט סברוה דרובע דכלאים כיותר מרובע דהכא וקא תני ימעט

more is not usual; he himself [therefore must have] mixed it. and since he has mixed [at least some of] it, the Rabbis have imposed upon him the penalty [of paying] for all.<span class="x" onmousemove="('comment',' Since he has mixed a portion he is suspected of having mixed the whole. ');">²⁰</span> (Mnemonic: <i>Every two bills of Rabin son of R. Nahman [are] overcharge and undertaking</i>.)<span class="x" onmousemove="('comment',' The mnemonic aids in the recollection of the passages that follow in support of, or objection to R. Huna's law. ');">²¹</span>

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