Cow dung

In Ezekiel 4:15, this signifies that the prophet was to represent the corruption of the literal sense of the Word. (The Inner Meaning of the Prophets and Psalms 127)

Ezekiel 21:9

⁹ Son of man, prophesy, and say, Thus says Yahweh: say, A sword, a sword, it is sharpened, and also furbished;