Reference for Bava Batra 337:2

אמר מר חוץ מאחריות שבו מאי טעמא

— R. Safra replied: Because two deeds may not be written In respect of the same field in case a creditor<span class="x" onmousemove="('comment',' Of the seller of that field. ');">⁴</span> might go and seize [the field] of this [person]<span class="x" onmousemove="('comment',' The buyer for whom a duplicate deed was written. ');">⁵</span> and [the latter]<span class="x" onmousemove="('comment',' Lit., 'that', the buyer from whom the field has been taken by the creditor and for whom a duplicate deed was written. V. previous note. ');">⁶</span> would go and produce one [deed]<span class="x" onmousemove="('comment',' The duplicate. ');">⁷</span>

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