Ezekiel 4:14-15

14But I said, “Ah, Lord God! Behold (hear me), I have never been defiled; for from my youth until now I have never eaten what died on its own or was torn by beasts, nor has any unclean meat ever entered my mouth.”

15Then He said to me, “See, I will let you use cow’s dung instead of human dung over which you shall prepare your food.”