An oven of stone or of metal is tahor, but [the metal oven] is tamei as a metal utensil. [If] it developed a hole [or] became damaged [or] cracked [and] one made a [clay] coating for it or a supplement of clay, it is tamei. How large must the hole be? [Large] enough for the flame to pass through. And the same applies to a stove. A stove of stone or of metal is tahor, but [the metal stove] is tamei as a metal utensil. [If] it developed a hole [or] became damaged [or] cracked [and] one made feet for it, it is tamei. If one plastered it with clay, whether on the inside or on the outside, it is tahor. R’ Yehudah says: On the inside it is tamei, but on the outside it is tahor.

[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.