Tafsiran Keluaran 34:20: Rashi, Chizkuni, Sforno & Rabbeinu Bahya

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.

Rashi

ופטר חמור AND THE FIRST OFFSPRING OF AN ASS [THOU SHALT REDEEM] — but not that of any other unclean animal (Bekhorot 5b).
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Chizkuni

ופטר חמור תפדה, “and the firstborn male donkey you shall redeem;” why is this repeated? It is not fit as a sacrifice.
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Sforno

בכור בניך תפדה, the amount to be paid has been spelled out in Numbers 18,16.
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Rashi

תפדה בשה THOU SHALT REDEEM WITH A LAMB — one gives a lamb to the priest and it remains in his possession with the character of a non-holy object (חולין — an ordinary animal). The firstborn ass is then permitted to the owner to be used for work (Bekhorot 9b).
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Rashi

וערפתו THEN THOU SHALT BREAK ITS NECK — one breaks its neck with a hatchet and so slays it (Bekhorot 10b). The reason is: he (the owner of the ass) has caused loss to the possessions of the priest (by not giving him the lamb) therefore must he suffer loss in his possessions (Mekhilta).
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