The Basics of Judaism: Basic Values and Morality: Redeeming First Born Donkeys:
Why do first born donkeys have to be redeemed, but not firstborn of other nonkosher animals?
It would seem that the laws of the first born should apply to all unclean
animal species, not just to donkeys (see Num. 18:15); but the Torah
specifies (Ex.13:13) that they apply only to donkeys. The commentary of
Ibn Ezra suggests that when the Jews were in Egypt, the only unkosher
animals that they owned were donkeys, and the laws of the first born
are applicable only to animals that Jews owned at that time.
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