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|Ritual purity in Judaism|
In the realm of tumah and taharah terminology, the term Av HaTumah (father of tumah, or simply Av) is a rabbinic term for a person or object that is in a state of tumah (ritual impurity) to the second degree.
A person or object that is a Av HaTumah has the ability to transfer its tumah to another person or object (usually at a downgraded level of tumah).
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A person or object that is under Av HaTumah status can usually be purified by immersion in a mikveh and the elapse of sunset.
An exception to purification eligibility are Terracotta vessels (that cannot be purified until broken).
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