Reference for Bava Batra 187:1

נותן לו דמי חטין

he must pay him [for it] the price<span class="x" onmousemove="('comment',' Because the seller is entitled to include a pebble in the weight of his wheat and to receive for it the price of the wheat; but is not permitted to put in a pebble. ');">¹</span> of wheat!<span class="x" onmousemove="('comment',' This shows that sandy matter, such as a pebble is, must also be accepted by the buyer. How, then, can it be said that sandy matter need not be accepted? ');">²</span>

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