כִּ֣י לִי֮ כָּל־בְּכוֹר֒ בְּיוֹם֩ הַכֹּתִ֨י כָל־בְּכ֜וֹר בְּאֶ֣רֶץ מִצְרַ֗יִם הִקְדַּ֨שְׁתִּי לִ֤י כָל־בְּכוֹר֙ בְּיִשְׂרָאֵ֔ל מֵאָדָ֖ם עַד־בְּהֵמָ֑ה לִ֥י יִהְי֖וּ אֲנִ֥י יְהוָֽה׃ (ס)
Sebab semua anak sulung adalah milik-Ku. Pada waktu Aku membunuh semua anak sulung di tanah Mesir, Aku telah menguduskan bagi-Ku semua anak sulung di Israel, baik manusia maupun hewan. Mereka akan menjadi milik-Ku. Akulah Yang Mahakekal.
English Explanation of Mishnah Bekhorot
[An Israelite] who buys a fetus of a donkey 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 donkey] 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. In order for a Jew to be liable to redeem the first-born of a donkey, a non-Jew cannot have any ownership or partial ownership over the donkey. So if a Jew buys a fetus (assumedly he buys a pregnant donkey) from a non-Jew it is exempt from the laws of the first-born, because it was conceived under non-Jewish ownership. Similarly, if he sells the fetus to the non-Jew, it is exempt. The mishnah notes that selling a donkey to a non-Jew is not permitted because it is forbidden to sell a large animal to a non-Jew (see Avodah Zarah 1:6). Nevertheless, if one does sell the donkey, it is exempt. If a Jew and a non-Jew are partners in owning a donkey it is exempt. If a Jew receives a donkey to take care of, and in return he keeps some of the offspring, or if he gives the donkey to the non-Jew to take care of and the non-Jew keeps some of the offspring, in both of these cases, the donkey is exempt because the non-Jew has some level of ownership over the animal. The exemption of non-Jews from these laws is derived from the word “in Israel,” which means that the law of the bekhor applies only to animals fully owned by Israelites.
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.