بسم الله الرحمن الرحيم

When a person’s arm, leg or other bones are broken or fractured, doctors put a plaster-cast to support the limb as it heals. Without the permission of the doctor, opening this plaster is likely to be detrimental. Even if it is not harmful, to repeatedly remove and replace it will be costly.  As such, like a jabirah (wooden splint), it will not be necessary to wash the part of the limb beneath the cast, rather masah will be sufficient.

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للمفتي محمد أشرف الاشاعتي

Vol.1 Pg.119