Reference for Bava Batra 327:12
רבי חנינא בן גמליאל אומר מקושר וכו': השיב רבי לדברי ר' חנינא בן גמליאל
But let any<span class="x" onmousemove="('comment',' Lit., 'another'. ');"><sup>32</sup></span> scroll be brought, [on which some writing could] be erased, and compared!<span class="x" onmousemove="('comment',' With the erasure on the deed. The comparison would determine whether the writing on the deed was erased once or twice. ');"><sup>33</sup></span> — The erasure on one scroll is not [always] like the erasure on another scroll.<span class="x" onmousemove="('comment',' One of them may be thicker than the other and would not show up the erasure as well as the other. ');"><sup>34</sup></span> Let, then, the signatures of the witnesses be accepted by the court,<span class="x" onmousemove="('comment',' Provisionally, until it had been ascertained whether the text was, or was not a forgery. ');"><sup>35</sup></span> and be erased and compared!<span class="x" onmousemove="('comment',' With the erasure on which the text of the deed is written. CF. supra note 11. ');"><sup>36</sup></span> — R. Hoshaia replied: An erasure of one day's [standing] is not like an erasure of two days [standing]. Let it stand [for some time]!<span class="x" onmousemove="('comment',' When the difference between the old, and the new erasure would disappear and comparison could be made between the erasures on the two sections of the deed. ');"><sup>37</sup></span> — R. Jeremiah replied: Precaution had to be taken [to provide] against an erring court.<span class="x" onmousemove="('comment',' Which might not think of comparing erasures and, relying on the clear signatures of the witnesses, could accept the validity of the deed. (R. Gersh.) Which might not be aware of the fact that an old erasure differs in appearance from a new one and would, consequently, accept a forged document as genuine (Rashb., cf. BaH, a.l.). Hence it was ordained that any deed the text of which appears on an erasure and the signatures of its witnesses on a clean section of the paper is invalid. ');"><sup>38</sup></span> R. HANINA B. GAMALIEL SAID: A FOLDED [DEED] ETC. Rabbi raised an objection against the statement<span class="x" onmousemove="('comment',' That a folded deed may be turned into a plain one. ');"><sup>39</sup></span> of R. Hanina b. Gamaliel: