Reference for Bava Metzia 144:1

מודה בשטר שכתבו אינו צריך לקיימו וגובה מנכסים משועבדים

If he [the debtor] admits the genuineness of a bond, he [the creditor] need not confirm it'<span class="x" onmousemove="('comment',' For if the debtor asserts that it is forged, the signatories thereto must attest their signatures. ');">¹</span> and can collect [his debt] from mortgaged property [sold after the debt was contracted]!<span class="x" onmousemove="('comment',' [V. supra 7a. Similarly here, since he admits having written the deed, the money liability involved ought to rank as a written debt!] ');">²</span>

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