Reference for Bava Batra 337:10

אמרוה רבנן קמיה דרב פפא ואמרי לה קמיה דרב אשי זאת אומרת אין כותבין שובר

— If [he were to do] so [he would have had too] many litigants against him.<span class="x" onmousemove="('comment',' And his conspiracy might thereby be more likely to be discovered. ');">³³</span> And [why] should [not] a proper deed<span class="x" onmousemove="('comment',' One containing the clause pledging the seller's lands. ');">³⁴</span> be written for that [man],<span class="x" onmousemove="('comment',' Spoken of in the Baraitha (supra 168b, end), who pleads that he lost his deed and requests that a duplicate be given to him in its stead. ');">³⁵</span> while, for the seller,<span class="x" onmousemove="('comment',' In order to protect him against being called upon by the production of two deeds, to pay the buyer twice. ');">³⁶</span> [the following quittance might] be written out: 'All deeds that [may] be produced against this land are invalid except the one bearing<span class="x" onmousemove="('comment',' Lit., 'that will go out with'. ');">³⁷</span> this date'?<span class="x" onmousemove="('comment',' That in the duplicate. Should the buyer ever present the first deed, the seller could prove its invalidity by the production of his quittance. ');">³⁸</span> The Rabbis recited this before R. Papa — and others say, before R. Ashi — [and suggested that] this proves [that] no quittance is [ever] to be written.<span class="x" onmousemove="('comment',' I.e., a debtor cannot be compelled to repay a loan unless his bond is returned to him. He is not obliged to become the keeper of a quittance. Cf. Mishnah 170b, infra. ');">³⁹</span>

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