Leviticus 11:26

“You shall take with you of every clean animal by sevens, a male and his female; and of the animals that are not clean, two, a male and his female;

Then Noah built an altar to Yahweh and took of every clean animal and of every clean bird and offered burnt offerings on the altar.

‘Or a person who touches any unclean thing, whether a carcass of an unclean beast or the carcass of unclean cattle or a carcass of unclean swarming things—though it is hidden from him, yet he is unclean—will be guilty.

‘You are therefore to separate between the clean animal and the unclean, and between the unclean bird and the clean; and you shall not make yourselves detestable by animal or by bird or by anything that creeps on the ground, which I have separated for you as unclean.

‘No man of the seed of Aaron, who is a leper or who has a discharge, may eat of the holy gifts until he is clean. And if one touches anything made unclean by a corpse, or if a man has a seminal emission,

or if a man touches any teeming things by which he is made unclean or any man by whom he is made unclean, whatever his uncleanness,

“These are the animals which you may eat: the ox, the sheep, the goat,

since they relate only to food and drink and various washings, requirements for the body imposed until a time of reformation.