Reference for Bava Metzia 154:10

א"ר נחמן בר יצחק מעידית שבה ומזיבורית שבה

But let him [the buyer] be even as an ordinary creditor! And we learnt: A creditor is entitled to medium quality!<span class="x" onmousemove="('comment',' If the debtor does not repay, the creditor can exact payment only from his medium quality fields, not from the best. And even that is a special privilege. ');">⁹</span>

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