Bava Batra

Rabban Simeon b. Gamaliel said: Deeds of purchase and sale also [must] not be re-written.  for thus said Rabban Simeon b. Gamaliel: Where a person made a gift to his friend and [the latter] returned the deed to him, his gift [also is, thereby] returned.  But the Sages say: His gift is valid. The Master had said, 'with the exception of its land security'; what is the reason?  — R. Safra replied: Because two deeds may not be written In respect of the same field in case a creditor  might go and seize [the field] of this [person]  and [the latter]  would go and produce one [deed]  and seize [thereby the lands of subsequent] buyers.  He  would [then] say to the creditor.  'Wait  until I am firmly established in the possession of this field  and then come and seize it  from me. He would [then]  produce the other [deed]  and [thereby] rob other buyers [also]. Since, however, the creditor's bond was torn,  whereby would he again seize [any] land?  And if it be said [that this might refer to a case] where it was not torn; surely, [it may be pointed out,] R. Nahman stated: Any tirpa  which does not contain  [the declaration], 'we have torn up the creditor's bond of indebtedness', Is not a [legal] tirpa;  and any adrakta  which does contain [the entry]  'we have torn up the tirpa is not a [legal] adrakta;  I and any shuma  in which [the statement]. 'We have torn up the adrakta' is not entered  is not a [legal] shuma!  — [The precaution was] necessary [in the case] only  where one asserts a claim by virtue of his paternal rights. R. Aha of Difti said to Rabina: Why [should it be necessary]  for him  to say to the creditor, 'Wait until I am firmly established in the possession of this land'?  This  [surely], could be derived [from the fact] that since he  holds two deeds he [can] seize [once] and [immediately] seize again!  — If [he were to do] so [he would have had too] many litigants against him. And [why] should [not] a proper deed  be written for that [man],  while, for the seller,  [the following quittance might] be written out: 'All deeds that [may] be produced against this land are invalid except the one bearing  this date'?  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.