וּפֶ֤טֶר חֲמוֹר֙ תִּפְדֶּ֣ה בְשֶׂ֔ה וְאִם־לֹ֥א תִפְדֶּ֖ה וַעֲרַפְתּ֑וֹ כֹּ֣ל בְּכ֤וֹר בָּנֶ֙יךָ֙ תִּפְדֶּ֔ה וְלֹֽא־יֵרָא֥וּ פָנַ֖י רֵיקָֽם׃
Anak sulung keledai haruslah kautebus dengan seekor anak domba; jika engkau tidak menebusnya, patahkanlah tengkuknya. Setiap anak sulung di antara anak-anakmu laki-laki haruslah kautebus. Janganlah seorang pun menghadap ke hadirat-Ku dengan tangan hampa.
Bartenura
כפדיון מעשר שני – for if it was lost, he is not liable to make it for that money the All-Merciful obligated to teat in Jerusalem, but surely it was lost to him, and the reason of Rabbi Eliezer for we have surely found that the Biblical verse made a comparison by juxtaposition between the first born of the ass and the first born of a human being, as it states (Exodus 34:20): “But the firstling of an ass you shall redeem with a sheep; [if you do not redeem it, you must break its neck.] And you must redeem every first-born among your sons.”
Rambam
As for the firstborn for the priesthood, it is the first child born to a woman, regardless of whether he is born to his father first or after another child. This is based on the verse "פֶּטֶר רֶחֶם" (Exodus 34:20).
Bartenura
והראיון – That a person is obligated to appear in the Temple court on the three Pilgrimage festivals (Passover, Shavuot and Sukkot), as it is written (Exodus 34:23), “Three times a year all your males shall appear [before the Sovereign LORD, the God of Israel,”(see also, Exodus 23:20 and Deuteronomy 16:16) for virtually identical language)” and this appearance in the Temple has no fixed measure, for whenever that he (i.e., that person) wishes to, he goes up and appears and then leaves. Another interpretation: The burnt offerings of “appearing” and the peace offerings [brought] as the festive offering of the visitors of the Temple on the festivals which [a person] is obligated to bring as it is written (Exodus 34:20) “…None shall appear before Me empty-handed” (see also Deuteronomy 16:16 for an identical command)., have no [fixed] measure from the Torah, as it is written (Deuteronomy 16:17), “but each with his own gift, [according to the blessing that the LORD your God has bestowed upon you],” but the Sages gave them a measure (see Mishnah Hagigah 1:2 in a dispute between the School of Shammai and the School of Hillel), the burnt offering is one m’ah silver and the festival offering is two silver pieces.