And every open vessel
 An earthen one, as the Targum of Jonathan; and so Jarchi interprets it; and Maimonides F18 observes, that this is only to be understood of an earthen vessel: 
 which hath no covering bound upon it;
 a linen or a woollen cloth wrapped and tied about it: 
 [is] unclean;
 the air of the house getting into it by its being uncovered.