Reference for Bava Batra 187:5

אלא טעמא דעדשים דמיעקר עקרי להו אבל חטי ושערי לא תפשוט מינה חטי ושערי דעפרורית לא מקבל

[applies not only to lentils but also] to wheat and to barley?<span class="x" onmousemove="('comment',' It is assumed that sandy matter was mentioned in the case of lentils because it is usual to find it there just as pulse. e.g.. was mentioned with wheat with which it is usually mixed up; but that in reality the buyer must accept a quarter of a kab of sandy matter, or any refuse, in whatever kind of produce it is found. ');">⁹</span> Lentils are different [from wheat and barley], because they are usually plucked.<span class="x" onmousemove="('comment',' And more sandy matter must, therefore, be expected. ');">¹⁰</span>

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