[If] one assembled three feet upon the ground and joined them with clay so that he could set the pot on top of them, [this makeshift stove] is tamei. [If] one affixed three nails into the ground so that he could set the pot on top of them, even though he fashioned a place at the top of [this makeshift stove] for the pot to rest, it is tahor. [If] one made two stones into a stove and joined them with clay, it is tamei. R’ Yehudah rules [it] tahor until he makes a third [stone] or until he places [the stove] near a wall. [If] one [stone was joined] with clay and one was not [joined] with clay, it is tahor.

[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.

Two stones were made into a stove and became tamei, [and then] one placed a stone next to [one of the tamei stones] on one side, and a stone next to [the other tamei stone] on the other side: Half of [one tamei stone] is tamei and half of it is tahor, and half of [the other tamei stone] is tamei and half of it is tahor. [If] the tahor [stones] were removed, the others return to their state of tumah.