Reference for Bava Batra 187:4

מאי לאו הוא הדין לחטים ולשעורין שאני עדשים דמיעקר עקרי להו

for [each] <i>se'ah</i>; [in the case of] lentils, he must accept a quarter [of a <i>kab</i> of] sandy matter<span class="x" onmousemove="('comment',' Sandy matter is usually mixed up with lentils. ');">⁷</span> for [each] <i>se'ah</i>. Now, may it not be assumed that the same law<span class="x" onmousemove="('comment',' That a quarter of a kab of sandy matter must be accepted by the buyer. ');">⁸</span>

Jastrow

Jastrow

Jastrow