Numbers 19:15
"And every open vessel, which hath no covering bound upon it, is unclean."
Cross References (ranked by relevance)
Then the priest shall command that they empty the house, before the priest go into it to see the plague, that all that is in the house be not made unclean: and afterward the priest shall go in to see the house:
And upon whatsoever any of them, when they are dead, doth fall, it shall be unclean; whether it be any vessel of wood, or raiment, or skin, or sack, whatsoever vessel it be, wherein any work is done, it must be put into water, and it shall be unclean until the even; so it shall be cleansed.
And purify all your raiment, and all that is made of skins, and all work of goats’ hair, and all things made of wood.