Ezekiel 4:10-17

10 The food that you eat shall be twenty shekels a day by weight; at fixed times you shall eat it.
11 And you shall drink water by measure, one-sixth of a hin; at fixed times you shall drink.
12 You shall eat it as a barley-cake, baking it in their sight on human dung.
13 The Lord said, "Thus shall the people of Israel eat their bread, unclean, among the nations to which I will drive them."
14 Then I said, "Ah Lord God! I have never defiled myself; from my youth up until now I have never eaten what died of itself or was torn by animals, nor has carrion flesh come into my mouth."
15 Then he said to me, "See, I will let you have cow's dung instead of human dung, on which you may prepare your bread."
16 Then he said to me, Mortal, I am going to break the staff of bread in Jerusalem; they shall eat bread by weight and with fearfulness; and they shall drink water by measure and in dismay.
17 Lacking bread and water, they will look at one another in dismay, and waste away under their punishment.