Keilim 5:11-6:1

Keilim 5:11

An oven of stone or metal is not susceptible to ritual impurity but the latter is susceptible as a metal vessel. If it was perforated, chipped or cracked so he coated it or made an addition of clay, it is susceptible. In order to purify it, a hole must be large enough for the flame to come out through. This is also true of a stove, i.e., a stove of stone or metal is not susceptible to ritual impurity but the latter is susceptible as a metal vessel. If it was perforated, chipped or cracked but he made legs to fix it, it is susceptible. If he coated it with clay, either inside or outside, it remains insusceptible to impurity. Rabbi Yehuda says that if he coated it on the inside, it is susceptible; on the outside, it remains insusceptible.

Keilim 6:1

If a person put three legs in the ground and fastened them with clay so that a pot could rest on them, it is susceptible to ritual impurity. If he drove three nails into the ground so that a pot could rest on them, then it is not susceptible to ritual impurity even if he made a place on the top for the pot to sit. If a person made a stove out of two stones, fastening them with clay, it is susceptible to ritual impurity; Rabbi Yehuda says that it insusceptible until a third stone is added or it is placed near a wall. If one stone was fastened with clay and the other was not, it is not susceptible to ritual impurity.