Leviticus 6:28
A clay pot in which the sin offering is boiled must be broken; if it is boiled in a bronze vessel, it must be scoured and rinsed with water.
Leviticus 11:33
If any of them falls into any clay pot, everything in it will become unclean; you must break it.
Leviticus 15:12
Any clay pot that the man with the discharge touches must be broken, while any wooden utensil must be rinsed with water.
Hebrews 9:9-10
This is a symbol for the present time, during which gifts and sacrifices are offered that cannot perfect the worshiper’s conscience.