The ass was an unclean creature, and therefore this rule was to be observed in all other unclean creatures, as appears,
1. Because the reason of this law is common to all such.
2. By comparing this place with Numbers 18:15.
3. Because the first-born of all beasts were appropriated to God; and because many of them were unclean, and so could not be sacrificed, there was no other way of offering them to God, but by redemption, or a price paid for them. And the single exception of the price of a dog in this case, Deuteronomy 23:18, doth sufficiently intimate that the price of all other unclean creatures was allowed and required. The ass alone is here named for all the rest, because this creature was most common, and most useful, and yet was not to be spared; whence it was easy to infer, that this course was much rather to be observed in other creatures which were of less use. Thou shalt break his neck; or, cut off his neck, or head, as the word is used, Deuteronomy 21:4 Isaiah 66:3; because being consecrated. to God, it was not to be applied to any profane or common use.