We find a similar ruling earlier (6a), where the Gemara teaches that if a
person first says that he never borrowed money from the claimant, and
afterwards witnesses testify that he did borrow money but he paid it back,
the defendant cannot claim -- as the witnesses say -- that he borrowed and
paid it back. Rather, his first claim is upheld in court, and by saying that
he did not borrow, he effectively has admitted that he did not pay back any
money. We therefore obligate him to repay the loan based on his admission
that no money was paid back.
In the cases of these Gemaras, the Machzik changed his claim *after*
witnesses came and contradicted his first claim. Is a person allowed to
change his claim *before* any contradictory evidence is presented in court?
(a) TOSFOS (32b, DH Amai) implies that a person cannot change his claim,
even when no contradictory evidence has been brought. This also seems to be
the opinion of the RASHBAM (33b, DH Meheman).
The logic of Tosfos seems to be that the first claim was an implied
admission that there is no other factor to support defendant's position. If
the defendant says that his parent's acquired the field, it is as if he
admits that *he* did *not* acquire the field. His admission, the Hoda'as
Ba'al Din, overrides his later claim, as the Rashbam writes (last line of
30b).
(b) The TUR (CM 80) cites the YAD RAMAH in our Sugya who maintains that
before the defendant's claim is contradicted in court, he may change his
original claim and make a different claim to support his case (for example,
if he originally said "I never borrowed," he can change his mind and say "I
borrowed but I paid it back" as long as no witnesses are brought to testify
that he borrowed). The Tur explains that the defendant's second claim is
accepted because of a Migu: had he wanted, he could have remained silent and
maintained his original claim, which would have won the case for him. Now
that he changes his claim to a different claim, he is believed with a Migu
that he could have remained silent.
The MAGID MISHNAH (Hilchos To'en v'Nit'an 7:8) and the RI MI'GASH (see (c)
below) cite support for this from the fact that our Gemara makes a point of
saying that only after the claim of the Machzik was contradicted by
witnesses did the Machzik change his claim ("*Hadar* Amar Lei;" see also
BI'UR HA'GRA CM 79:21 and 80:5, who cites further support from the
Yerushalmi in Shevuos).
The Ramah adds that if testimony is brought later to contradict the original
claim, the defendant's second claim is no longer accepted. The BEIS YOSEF
explains that the reason for this is because the defendant's second claim
was accepted only because of a Migu that he could have remained with the
first claim. When the first claim is contradicted -- even after the second
claim was made -- there no longer is a Migu and the second claim is not
accepted (as we see in the Mishnah in Kesuvos 16a and 18b).
The KOVETZ SHI'URIM (#113) asks why should the second claim be accepted with
a Migu? That claim is contradicted by the implicit Hoda'as Ba'al Din of the
first claim, and we know that Hoda'as Ba'al Din is tantamount to testimony
of witnesses. Just as a Migu does not give a person credibility to counter
the testimony of witnesses, it should also not give him credibility to
contradict a Hoda'as Ba'al Din. The Kovetz Shi'urim answers that the second
claim does not contradict Hoda'as Ba'al Din, because the person is saying
that his original claim was mistaken, or that it was based on a
misunderstanding or on forgotten facts (or whatever excuse the Ba'al Din
gives when he presents the second claim). If a witness would try to change
his own testimony in such a manner, we would *not* accept his second
testimony, because of the rule "Kivan she'Higid Shuv Eino Chozer u'Magid"
(Kesuvos 18b), which teaches that a witness cannot change his testimony even
if he gives an excuse to explain why he originally presented different
testimony. This rule, however, does not apply to Hoda'as Ba'al Din. Even
though Hoda'as Ba'al Din is tantamount to testimony of witnesses,
nevertheless the rule of "Kivan she'Higid" applies only to actual testimony
of witnesses and not to Hoda'as Ba'al Din.
According to this, though, why is it necessary for the Tur to mention a Migu
at all? The Ba'al Din should be believed for the same reason that his first
claim was believed -- because he is presenting a valid claim in court! (See
Kovetz Shi'urim there, #113.)
The answer seems to be that it looks suspicious when a person retracts from
a claim that he presented in court, because, normally, people think
carefully about what they will say in front of the court. For this reason,
we would not believe the second claim if not for the Migu. (M. Kornfeld)
(c) The RI MI'GASH and the RAMBAM (Hilchos To'en v'Nit'an 7:8) also write
that the defendant can change his claim in court before it is contradicted
by witnesses. However, they add that if witnesses later come and contradict
the original claim, we still accept the new claim of the defendant (which is
not contradicted by witnesses, since the claimant changed his mind before
the appearance of witnesses).
How can this be? If the defendant's second claim is accepted only because of
a Migu, then even when witnesses come *after* his second claim, their
testimony should render the Migu invalid! This principle of the laws of Migu
is clear from many Mishnayos (see Kesuvos 16a, 18b, 22a; see also ME'IRI
there 16a, who cites, and argues with, some Rishonim who seem to contradict
this principle). (See KETZOS HA'CHOSHEN 80:3. See KOVETZ SHIURIM #112, who
attempts to refute the proofs from the Mishnayos in Kesuvos. However, his
words do not address the cases there on 16a and 18b. See also the footnotes
of RAV MOSHE SHMUEL SHAPIRO on the Ri mi'Gash.)
The answer is that the Ri mi'Gash and the Rambam apparently hold that a
person may present a second claim and change his first claim even without
resorting to a Migu. Rather, just as he is believed to present a first
claim, he is believed to present a second claim, as we suggested in our
question on the explanation of the Yad Ramah above. Since he is believed
without a Migu, even if witness come later the second claim remains valid
and is accepted. Why is the second claim *not* accepted if witnesses testify
and contradict the first claim *before* the defendant changes his claim? Why
should the second claim not be accepted the same way we accept it when he
changes his mind before witnesses come? The answer is that if witnesses
contradict his claim, then the defendant becomes "Huchzak Kafran," he
becomes confirmed as a liar, and that makes his credibility much worse, and
we do not accept his second claim after that point, as the Rambam himself
writes (Hilchos To'en v'Nit'an 6:6:), and as the RASHBA writes (in Teshuvos
6:38), as well as the SHULCHAN ARUCH (CM 79:9). If a person changes his mind
before the witnesses come, he is not "Huchzak Kafran" and therefore he is
believed. If he changes his mind after witnesses come, then he is not
believed because he is "Huchzak Kafran," and not because of the Hoda'as
Ba'al Din as the Rashbam writes (end of 30b). This is also what the HAGAHOS
MAIMONIS writes (in Hilchos To'en v'Nit'an 7:20).
However, the TUR (CM 80) -- when he quotes the RI MI'GASH -- writes that the
Ri mi'Gash accepts the second claim because of the Migu (contrary to what we
have explained)! His source is, as the MAGID MISHNAH (Hilchos To'en v'Nit'an
7:8) writes, that it is because of the Migu that the Rambam gives
credibility to the second claim (see also SHACH CM 79:23). If it is because
of the Migu, then why should he be believed after witnesses contradict his
first claim?
The KETZOS HA'CHOSHEN answers that the Tur does not really mean that the
defendant's second claim is believed because of the Migu. Rather, the Tur
means that since the defendant was not yet contradicted in court, his claim
is not considered to be Hoda'as Ba'al Din. However, as we said, the wording
of the Tur and the Magid Mishnah implies that there is a Migu.
Perhaps the reason why a Migu is necessary is because both the Tur and the
Magid Mishnah write that the second claim is believed even if the defendant
left the court after presenting the first claim and then returned and
presented the second claim. Our Gemara says that when a defendant leaves the
court and comes back with a new claim, we suspect that someone outside the
court was counseling him what claims to make. Perhaps in such a case we
would only believe the defendant's second claim because of a Migu. In such a
case, where the defendant presents his second claim only after returning to
the court, when witnesses come later to contradict his first claim his
second claim indeed is *not* accepted (because he no longer has a Migu). The
Ri mi'Gash and the Rambam accept the defendant's second claim only when he
presented the second claim without leaving the court after his first claim.
This fits well with the wording of the Rambam and the Magid Mishnah. (M.
Kornfeld)