33. And to everyone, We have appointed heirs of that (property) left by parents and relatives. To those also with whom you have made a pledge (brotherhood), give them their due portion (by Wasiyyah - will)[3]. Truly, Allâh is Ever a Witness over all things.
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(V.4:33) See for details Hadith No.489, Vol.3, Sahih Al-Bukhâri