Deuteronomy 14:3

“Ah, Lord GOD,” I said, “I have never defiled myself. From my youth until now I have not eaten anything found dead or mauled by wild beasts. No unclean meat has ever entered my mouth.”

You are therefore to distinguish between clean and unclean animals and birds. Do not become contaminated by any animal or bird, or by anything that crawls on the ground; I have set these apart as unclean for you.

I am convinced and fully persuaded in the Lord Jesus that nothing is unclean in itself. But if anyone regards something as unclean, then for him it is unclean.

Do not defile yourselves by any crawling creature; do not become unclean or defiled by them.

But if someone tells you, “This food was offered to idols,” then do not eat it, for the sake of the one who told you and for the sake of conscience—

sitting among the graves, spending nights in secret places, eating the meat of pigs and polluted broth from their bowls.

It contained all kinds of four-footed animals and reptiles of the earth, as well as birds of the air.

To the pure, all things are pure; but to the defiled and unbelieving, nothing is pure. Indeed, both their minds and their consciences are defiled.