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Mishnayos Bechoros Perek 3 Mishnah 2

בכורות פרק ג׳ משנה ב׳

2

Rabban Shimon ben Gamliel says: In the case of one who purchases a nursing female animal from a gentile, he does not need to be concerned, i.e., take into account the possibility, that perhaps it was nursing the offspring of another animal. Rather, the buyer may assume it had previously given birth. In the case of one who enters amid his flock and sees mother animals that gave birth for the first time that were nursing, and also sees mother animals that gave birth not for the first time that were also nursing, he does not need to be concerned that perhaps the offspring of this animal came to that animal to be nursed, or that perhaps the offspring of that animal came to this animal to be nursed.

רַבָּן שִׁמְעוֹן בֶּן גַּמְלִיאֵל אוֹמֵר, הַלּוֹקֵחַ בְּהֵמָה מְנִיקָה מִן הַנָּכְרִי, אֵינוֹ חוֹשֵׁשׁ שֶׁמָּא בְנָהּ שֶׁל אַחֶרֶת הָיָה. נִכְנַס לְתוֹךְ עֶדְרוֹ וְרָאָה אֶת הַמַּבְכִּירוֹת מְנִיקוֹת וְאֶת שֶׁאֵינָן מַבְכִּירוֹת מְנִיקוֹת, אֵינוֹ חוֹשֵׁשׁ שֶׁמָּא בְנָהּ שֶׁל זוֹ בָּא לוֹ אֵצֶל זוֹ, אוֹ שֶׁמָּא בְנָהּ שֶׁל זוֹ בָּא לוֹ אֵצֶל זוֹ:

ב׳
Bartenura

אין חוששין שמא בנה של אחרת היה - that what comes (i.e., the offspring) after it is a doubtful firstling, that we would say: “this animal never gave birth, but that she loved this one, the male offspring of her neighbor,” but if because that she has milk, there is a minority of those giving milk even though they have not given birth, but certainly we don’t say, that it is her offspring and that she is exempt from the laws of firstlings (see Talmud Bekhorot 20b).

מבכירות – female animals that did not give birth until now.

אין חוששין שמא בנה של זו בא לו אצל זו – for we should be troubled for all of them of a doubtful firstling status, but certainly, those that are running after/clinging to those animals that have given birth for the first time were definite firstlings, but those running after/clinging to those animals that were not giving birth for the first time were definitely plain (i.e., not firstlings). And the Halakha is according to Rabban Shimon ben Gamaliel.

אין חוששין שמא בנה של אחרת היה. שיהא הבא אחריו בכור ספק דנימא הך בהמה לא ילדה מעולם אלא שאהבה את זה בן חברתה, ואי משום דאית לה חלב הא איכא מיעוטא דחולבות אע״פ שאינן יולדות, הא ודאי לא אמרינן אלא בנה הוא ופטורה מן הבכורה:

מבכירות. בחורות שלא ילדו עד עכשיו:

אין חוששין שמא בנה של זו בא לו אצל זו. דליחוש לכולהו בספק בכורות, אלא ודאי אותן הכרוכין אחר המבכירות הוו בכורות ודאין, והכרוכין אחר שאין מבכירות הוו פשוטין ודאין. והלכה כרשב״ג: