And an earthenware vessel that the one with the discharge touches shall be broken, and every vessel of wood shall be rinsed in water.
Leviticus 15:12

Clay vs wood. Both are often used as a metaphor of humanity. Perhaps there is a lesson here about different kinds of people. A hard heart cannot be made clean. This is why Pharaoh was doomed from the beginning. His heart was hard and he refused to soften it. So God made it even harder and used it to destroy him. #metzora