Se alguém compra um feto por nascer de um não-judeu, vende [um feto por nascer] a [um não-judeu], mesmo que não tenha permissão, tenha uma parceria com [um não-judeu], recebe [um feto de vaca não nascido] de [um não-judeu] ou dá [um feto de vaca por nascer] a [um não-judeu], [o feto de vaca não nascido] está isento das [obrigações do] primogênito. Como está escrito (Números 3:13): "em Israel", mas não por outros. Sacerdotes e levitas são obrigados, pois não estavam isentos das [obrigações do] primogênito de um animal kosher puro, (eram isentos apenas) da redenção do primogênito e [das obrigações] do primogênito de um burro.
Bartenura on Mishnah Bekhorot
הלוקח עובר פרתו. אע"פ שאינו רשאין – to sell him a large animal (see Tractate Bekhorot, Chapter 1, Mishnah 1 and Tractate Avodah Zarah, Chapter 1, Mishnah 6).
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English Explanation of Mishnah Bekhorot
Introduction
Chapter two begins to discuss the first-born of a pure animal, such as a cow. This first-born is holy and must be sacrificed and the meat is eaten by the priests. If it is blemished, it must still be given to the priest, but it need not be sacrificed.
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English Explanation of Mishnah Bekhorot
[An Israelite] who buys a fetus of a cow belonging to a non-Jew or who sells one to him, although this is not permitted, or who forms a partnership with him, or who receives [an animal] from him to look after or who gives [his cow] to him to look after, is exempt from the [law of the] bekhor, for it says: [“I sanctified to Me all the firstborn] in Israel,” (Numbers 3:13) but not in non-Jews. This is the same exact halakhah as was taught in the 1:1. See there for commentary.
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English Explanation of Mishnah Bekhorot
Priests and Levites are subject [to the law of the first-born pure animal]. They are not exempt from [the law of] the first-born of a clean animal, but only of a first-born son and the first-born of a donkey. Priests and Levites are exempt from two of the three types of bekhorot the first born of a donkey and their own first-born son. They are, however, liable for the first-born of a pure animal. If a priest or Levite owns a pure animal and it gives birth for the first time and the offspring is male, it must be sacrificed. Then the priest eats the meat, as is always the case.
