מסכת כלים

פרק כד משנה ג

שלש ערבות הן

There are three types of troughs:

a trough [used for kneading dough]

[with a capacity] from two logs until nine kavs

that cracked

[is susceptible to] the tumah of midras (as people would turn it over and use it as a stool; a trough larger than the specified size would ordinarily be repaired, and not used as a stool, smaller was too small to sit on comfortably);

if whole,

it is [susceptible to the] tumah of a corpse;

and a very large one [with a capacity of over 40 se'ahs of liquid, or two kors of dry goods]

is tahor from anything (it must be usual for a container to be carried while full for it to be susceptible to tumah, which is not the case with such a large trough).

שלש תבות הן

There are three types of chests:

a chest whose opening is from the side

[is susceptible to] the tumah of midras (as it would be sat upon while in use),

[one that opens] from above

is tahor from anything.