Deuteronomy 14:8

“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;

‘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.

“Speak to the sons of Israel, saying, ‘These are the creatures which you may eat from all the animals that are on the earth.

‘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.

But Peter said, “By no means, Lord, for I have never eaten anything defiled and unclean.”