John Gill Commentary Numbers 19:15

"And every open vessel, which hath no covering bound upon it, is unclean." — Numbers 19:15 (ASV)

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 has 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.

---

FOOTNOTES:

• F18: In Misn. Cholin, c. 1. sect. 6.