Leviticus 11:2

2Say to the sons of Israel: These are the animals that you ought to eat out of all the living things of the earth.
11:2 Animals which you are to eat, etc: The prohibition of so many kinds of beasts, birds, and fishes, in the law, was ordered, 1st, to exercise the people in obedience, and temperance; 2ndly, to restrain them from the vices of which these animals were symbols; 3rdly, because the things here forbidden were for the most part unwholesome, and not proper to be eaten; 4thly, that the people of God, by being obliged to abstain from things corporally unclean, might be trained up to seek a spiritual cleanness.(Challoner)
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