Reference for Bava Batra 187:10

(סימן כל תרי שטרי דראבין בר רב נחמן אונאה וקבלנותא)

And others say, [this is a] penalty,<span class="x" onmousemove="('comment',' The compensation is not based on the Biblical law, according to which a person is always assumed to consent to buy fruit together with a certain quantity of refuse. ');">¹⁸</span> [because] it is usual [only for] a quarter [of a <i>kab</i> of refuse] to be found [in each <i>se'ah</i>];<span class="x" onmousemove="('comment',' And the seller must not be penalised for this. ');">¹⁹</span>

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