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)
Acts 17:29
29
Forasmuch then as we are the offspring of God, we ought not to think that the Godhead is like unto gold, or silver, or stone, graven by art and man's device.