[If] one set a pot upon a stone and upon an oven, [or] upon [a stone] and upon a stove, [or] upon [a stone] and upon a kupach, it is tamei. [If one set a pot] upon [a stone] and upon a [second] stone, [or] upon [a stone] and upon the bedrock, [or] upon [a stone] and upon a wall, it is tahor. And this was the stove of the nezirim in Jerusalem that was [built] against the bedrock. The stove of butchers: When he places one stone alongside [another] stone, [and] one of them became tamei, the others do not become tamei.

Three stones were made into two stoves: [If] one of the outer [stones] became tamei, [the part of] the middle [stone] that serves the tamei [stone] is tamei, [and the part] that serves the tahor [stone] is tahor. [If] the tahor [stone] was removed, the middle [stone] becomes entirely tamei. [If] the tamei [stone] was removed, the middle [stone] becomes entirely tahor. [If] the two outer [stones] became tamei: If the middle [stone] was large, one allots as much as is needed to set [a pot] on either side and the remainder is tahor; but if it was small, it is entirely tamei. [If] the middle [stone] was removed: If a large cauldron can be set upon [the stove], it is tamei. If [the stone] was returned, it is tahor. If [the stone] was plastered with clay, it will be susceptible to tumah from when one heats it enough to cook the egg on it.