Thematic Bible: Ceremonially unclean food

Thou, therefore, take thee wheat and barley and peas and lentils and millet and spelt, and put them in one vessel, and make them ready for thee as bread, - during the number of days which thou art lying on thy side. a hundred and ninety days, shalt thou eat it; and thy food which thou shalt eat shall be by weight twenty shekels a day, - from time to time, shalt thou eat it; and water by measure, shalt thou drink the sixth part of a hin,-from time to time shalt thou drink; read more.
and as a barley cake, shalt thou eat it, - and the same with dung proceeding from man, shalt thou bake, before their eyes. Then said Yahweh, In like manner, shall the sons of Israel eat their bread defiled, - among the nations whither I will drive them. Then said, I, Ah! My Lord. Yahweh, lo! my person, hath not been defiled: neither of what hath died of itself nor of what hath been torn in pieces: have I eaten, from my youthful days even unto now, neither hath come into my mouth the flesh of a foul thing. So then he said unto me, See I have granted thee cows dung for mans dung, - and thou shalt prepare thy bread thereupon. And he said unto me, Son of man Behold me! breaking the staff of bread in Jerusalem, So shall they eat bread by weight and with anxious care, And water by measure, and in astonishment, shall they drink: that they may lack bread and water and be astonished one with another, and pine away in their punishment.