Ezekiel 4:12-15

12And you shall eat it as a barley cake, baking it in their sight on human dung."

13And the Lord said, "Thus shall the people of Israel eat their bread unclean, among the nations where I will drive them."

14Then I said, "Ah, Lord God! Behold, I have never defiled myself. From my youth up till now I have never eaten what died of itself or was torn by beasts, nor has tainted meat come into my mouth."

15Then he said to me, "See, I assign to you cow's dung instead of human dung, on which you may prepare your bread."