Leviticus 11:47 Commentary - Ellicott's Commentary for English Readers (Old and New Testaments)

(47) To make a difference.—Better, that ye may put difference, as the Authorised Version renders the same word in Lev. 10:10. That is, the design of the dietary law is to enable both the administrators of the law and the people to distinguish, by the characteristics and criteria specified above, between what is clean and unclean.

And between the beast that may be eaten.—From the fact that the same word, “beast,” is used in both clauses with regard to the animal which may be eaten and the one which may not be eaten without the qualifying adjunct “clean” and “unclean,” the administrators of the law during the second Temple concluded that the same clean animal is meant in both instances, under different conditions. The clean animal may be eaten when it is in a healthy state, but the same animal may not be eaten when it has organic defects, or is diseased. Hence they enacted the following canon: an animal is perfectly sound when it is capable of conceiving and bringing forth young. This is the reason why the LXX. renders the word beast here by viviparous.