What is the Torah source for the protection of a sealed cover (tzamid patil)?
Halacha 1: Numbers 19:15 states: 'Any open container that does not have a sealed covering on it is impure.' The inverse inference (contained within an ohel with a sealed cover = pure) is the Scriptural source.
Question 2
An earthenware jug is inverted upside down in a house where there is a corpse. Does it protect everything under it?
Halacha 3: Earthenware does not protect as an ohel. The verse says 'a sealed cover on it' — the cover must be on top. When inverted, the sealed opening is at the bottom, so there is no protection. Only if its opening is attached to a wall with clay smeared on the sides does it protect.
Question 3
A samovar (vessel with 1-handbreadth walls) is placed outside a tent but with its opening flush against the tent wall. Impurity is under the samovar. Are items inside the samovar pure?
Halacha 4: A vessel with walls at least a handbreadth high, placed outside a tent but attached to the tent wall, is protected — the tent wall serves as the cover and the vessel contributes its own wall as required.
Question 4
What is the key difference between a new oven and an old oven regarding impurity protection?
Halacha 8: A new oven is classified as an ohel (not a vessel) — simple covering without sealed closure protects its contents. An old oven is classified as a regular vessel — it only protects its contents when sealed close (tzamid patil).
Question 5
An old oven inside a new oven: the serida cover rests on the new oven. If the old oven is removed, would the serida fall? What is the ruling?
Halacha 9: We assess: if removing the old oven would cause the serida to fall, it was the old oven holding it up — the serida was not independently sealed, so the contents are impure. If the serida would stay up without the old oven, it is independently positioned and everything is pure.