Once the Gemara assumes that it is possible to sell a Shtar Chov, we should
consider it the total possession of the buyer. Why, then, can the original
lender effectively forgive and cancel the debt? Since he sold the deed of
debt, he has no rights to it anymore, and thus he should be no different
than anyone else who has no power to affect the debt in any way!
(a) TOSFOS (DH ha'Mocher) is of the opinion that the entire institution of
Kinyan with regard to a Shtar is only mid'Rabanan. Since there is no
inherent worth to the Shtar besides its ability to be used as a proof, the
Shtar has no intrinsic value and cannot be transferred through a Kinyan.
Since the Kinyan is only mid'Rabanan, selling the Shtar does not remove the
lender's power altogether, and he still retains the ability to forgive and
cancel the debt.
(b) The RITVA cites RABEINU TAM who differentiates between the two types of
Shi'abud that occur with every loan. One type of Shi'abud is a "Shi'abud
ha'Guf," while the other is a "Shi'abud Nechasim." When a loan takes place,
the borrower becomes obligated to ensure that the loan is paid back; he must
do everything within his power to ensure that it is paid back. This is
called his "Shi'abud ha'Guf." In addition to this Shi'abud, all of the
possessions of the borrower become security for the loan. His possessions
are considered like an Arev, a guarantor, for the loan and become Meshu'abad
to the loan.
The Shi'abud on the possessions (Shi'abud Nechasim) can be transferred
through the normal means of a Kinyan (just like the possessions themselves
can be transferred through a Kinyan). In contrast, the Shi'abud ha'Guf is
not a tangible item and thus cannot be acquired or transferred through a
Kinyan. It follows that the sale of a Shtar Chov only affects the Shi'abud
Nechasim of that loan, and only the ownership of that Shi'abud has been
transferred to the buyer. The Shi'abud ha'Guf, though, remains in the
possession of the original lender, since a Kinyan cannot take effect on such
an item. The lender, therefore, can effectively cancel that Shi'abud. Once
the Shi'abud ha'Guf no longer exists, the Shi'abud Nechasim disappears
automatically. Since the possessions only serve as an Arev to the Shi'abud
ha'Guf, once the Shi'abud ha'Guf no longer exists, there is no Shi'abud for
which the possessions can serve as an Arev! (See KETZOS HA'CHOSHEN 66:37.)
(c) The RA'AVAD (Hilchos Mechirah 6) has a different understanding of why
the original lender is able to cancel the debt after he has sold the Shtar
Chov to someone else. The Ra'avad explains that when the buyer comes to
collect the loan written in the Shtar, he is not collecting his own personal
loan, as if the borrower had borrowed money directly from him. Rather, he is
using the rights of the original lender to collect (and to keep) the money
of that lender, whose power (with regard to this loan) he has acquired.
Accordingly, the Ra'avad explains, the buyer can collect the loan only as
long as the original lender still retains his power. If, however, the lender
forgave the loan, we now view the buyer as coming to collect the loan by
virtue of his own rights, in which case the borrower can claim that he was
never Mesha'abed himself directly to the person who bought the Shtar Chov,
and that he is willing to deal only with the party to whom he was Mesha'abed
himself. (This also appears to be the view of RASHI (DH Mochel) in our
Sugya.)
The view of the Ra'avad, and that of Rabeinu Tam, can help us understand the
difference that the Gemara makes between two types of loans. When referring
to a Milvah b'Shtar, a debt written in a contract, the Gemara says that
perhaps everyone agrees that "words can be acquired through Mesirah," and
the argument revolves around Shmuel's Halachah -- whether or not Mechilah
can be done after the sale of a Shtar.
When discussing a Milvah Al Peh (a debt not written in a contract, but only
agreed to verbally), however, the Gemara just mentions the Machlokes between
Rebbi and the Chachamim as depending on whether Ma'amad Sheloshtan applies
to a loan or not. The Rishonim (Tosfos, Ritva, and others) infer from here
that even though Mechilah can be done following the sale of a Shtar, it
cannot be done after a Kinyan of "Ma'amad Sheloshtan" (see Insights to Gitin
13:2).
According to the explanation of RABEINU TAM and the explanation of the
RA'AVAD, the difference between the two types of loans is clear. As we
explained above, the sale of a Shtar is a transaction between the lender and
the buyer exclusively, and the borrower has no role in the Kinyan at all. It
is merely a transfer of power from the lender to the buyer. Therefore, only
a Shi'abud Nechasim exists, according to Rabeinu Tam, and, according to the
reasoning of the Ra'avad, the borrower has no direct Shi'abud to the buyer.
The Kinyan of Ma'amad Sheloshtan, though, includes the direct involvement of
the borrower. Since his presence is necessary for the Kinyan to take effect,
we view it as though he is now directly obligating himself -- with a
Shi'abud ha'Guf -- to the buyer of the loan. Therefore, when the original
lender forgives the loan, he is only canceling the Shi'abud ha'Guf to
himself, but that is not enough to free the borrower from his obligation to
the buyer, since he now has a new, direct Shi'abud ha'Guf to the new owner
of the loan. In addition, as a result of the Kinyan of Ma'amad Sheloshtan,
the new owner of the loan is not merely acting in the place of the original
lender when he collects the loan, but he is acting independently on his own
behalf, for what is now considered his own loan to the borrower. (See
RITVA.)
How, though, are we to understand the difference between selling a Shtar and
making a Kinyan of Ma'amad Sheloshtan according to TOSFOS? Tosfos explains
that the ability of the original lender to forgive the debt is based on the
fact that the sale of a Shtar is only mid'Rabanan. The Gemara in Gitin
(14a), however, states that the Kinyan of Ma'amad Sheloshtan is also only
mid'Rabanan! Why, then, should there be a difference between selling a Shtar
and making a Kinyan of Ma'amad Sheloshtan?
The PNEI YEHOSHUA explains that since the Kinyan of Ma'amad Sheloshtan is
made in the presence of the borrower and with his consent, it has the power
of a Kinyan *d'Oraisa* (see there). (A. Kronengold)