Leviticus 11:3

3All that has a divided hoof, and that chews over again, among the cattle, you shall eat.
11:3 Hoof divided, and chews the cud: The dividing of the hoof and chewing of the cud, signify discretion between good and evil, and meditating on the law of God; and where either of these is wanting a man is unclean. In like manner fishes were reputed unclean that had not fins and scales: that is, souls that did not raise themselves up by prayer and cover themselves with the scales of virtue.(Challoner)
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