Clean and Unclean Animals

The distinction between clean and unclean animals appears first in Gen. vii. 2-3, 8, where it is said that Noah took into the ark seven and seven, male and female, of all kinds of clean beasts and fowls, and two and two, male and female, of all kinds of beasts and fowls that are not clean. Again, Gen. viii. 20 says that after the flood Noah "took of every clean beast and of every clean fowl, and offered burnt offerings on the altar that he had built to the Lord."