Leviticus 11:40

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.

and whoever picks up any of their carcasses shall wash his clothes and be unclean until evening.

“And the one who sent the goat out as the scapegoat shall wash his clothes and bathe his body with water; then afterward he shall come into the camp.

‘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,

‘He shall not eat an animal which dies or is torn by beasts, becoming unclean by it; I am Yahweh.

“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.