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Zevachim, 77

77b

OPINIONS: The Mishnah quotes Rebbi Eliezer who rules that in a case in which the limbs of valid Korbanos became mixed with the limbs of a blemished animal, if one of the heads was offered already, then the rest of the heads may also be offered. In the Gemara, Rebbi Elazar states that Rebbi Eliezer only permits offering the remaining, similar limbs if two are brought at a time, but not one at a time. RASHI (DH Ela Shenayim) explains the reasoning behind this. When two limbs are offered at the same time, then we know that one of them is definitely a permitted limb from a valid Korban. Since ("Migu") one of them is certainly permitted, we assume that the second one is also permitted, and that the forbidden limb was the first one that was offered earlier.

Does this reasoning apply in a case in which the limbs of valid Korbanos became mixed with the limbs of *two* blemished animals? In such a case, it certainly will not suffice to offer two similar limbs at a time, because it is possible that both limbs are from the blemished animals! However, will it suffice to offer three limbs at one time, or must one offer four limbs at one time?

(a) The SHACH (YD 110:47) asserts that *four* limbs must be offered at one time. As Rashi explains, when there is only one piece of Isur, one may offer two limbs at a time, because we apply the principle of "Migu" and say that just as one limb is definitely permitted, the other is also permitted. However, when there are two pieces of Isur, it will not suffice to offer three limbs at a time. Even though it is true that one of the three is definitely permitted, the "Migu" that one is permitted can only be used to prove that *one* other piece is permitted, but not that *two* other pieces are permitted, because here there is a chance that *both* of the other two are forbidden (since there were two pieces of Isur in the mixture). In order to apply the "Migu," there must be *two* pieces of definite Heter, and only then can we say that since two are definitely permitted, the other two are also permitted.

Accordingly, the Shach rules that when two pieces of Isur become mixed with pieces of Heter and one piece was offered already, Rebbi Eliezer maintains that in order to permit offering the remaining pieces, *four* pieces must be offered on the Mizbe'ach at one time.

(b) The CHAZON ISH (YD 37:20) disagrees with the Shach. He asserts that there is no logic to say that since there is one definite piece of Heter being offered, the other piece is also a piece of Heter. The Gemara does not mean to use any reasoning of "Migu" to permit the two pieces to be brought together. Rather, the reason why Rebbi Eliezer requires that two pieces be brought at one time is in order that the Korban that is being offered on the Mizbe'ach have the title of a permitted Korban, a Korban of Heter. As long as there is definitely a piece of Heter being offered, the offering has the title and status of Heter, and it does not concern us that the other piece might be Asur. Accordingly, even if there are two other pieces that might be Asur, the fact that one piece is definitely one of Heter gives the Korban the status of a permitted Korban and the mixture may be offered on the Mizbe'ach. (M. Dicker)