Is it obligatory to exhume a body buried without ritual washing (ghusl)?

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Exhumation and subsequent ritual washing of a buried body is obligatory if the deceased was buried without ghusl. This is the position held by Malik, Al-Shafi'i, and Abu Thawr. The justification is that the obligation of prayer (which includes ghusl) remains due and is not nullified by the improper burial; this is analogous to recovering property of value from the grave.