Voluntary hady perishes: a replacement is not independently required.
Obligatory hady perishes: the duty remains and a substitute is needed.
Obligatory hady becomes seriously defective: a sound replacement is required.
These are distinct cases. For instance, a compulsory penalty offering remains due if its designated animal dies before fulfilling the obligation.
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Bab al-Hady — Sacrificial Offerings, Eligibility, Slaughter and Handling
Voluntary hady perishes: a replacement is not independently required.
Obligatory hady perishes: the duty remains and a substitute is needed.
Obligatory hady becomes seriously defective: a sound replacement is required.
These are distinct cases. For instance, a compulsory penalty offering remains due if its designated animal dies before fulfilling the obligation.