Inheritance in an integral part of Islamic Shariah Law and its application in Islamic society is a mandatory aspect of Devine teaching of Islam.  Muslim inherits from each other is proven from Quran: “4:7 There is a share for men and a share for women from what is left by parents and those nearest related, whether, the property be small or large - a legal share.“ [An-Nisa 4:7] 

The Prophet Mohammad, may Allah’s mercy and peace be upon` him, said in his farewell sermon: “God has forbidden you to take Riba, therefore all riba obligation shall henceforth be waived. Your capital, however, is yours to keep. You will neither inflict nor suffer inequity. God has judged that there shall be no riba and that all the riba due to `Abbas ibn `Abd al Muttalib shall henceforth be waived" [Last Sermon]