Allah instructs you concerning your children: for the male, what is equal to the share of two females. But if there are [only] daughters, two or more, for them is two thirds of one's estate. And if there is only one, for her is half. And for one's parents, to each one of them is a sixth of his estate if he left children. But if he had no children and the parents [alone] inherit from him, then for his mother is one third. And if he had brothers [or sisters], for his mother is a sixth, after any bequest he [may have] made or debt. Your parents or your children - you know not which of them are nearest to you in benefit. [These shares are] an obligation [imposed] by Allah . Indeed, Allah is ever Knowing and Wise. Surat An-Nisa' (4: 11)
Fatima and Al 'Abbas came to Abu Bakr, seeking their share from the property of Allah's Apostle and at that time, they were asking for their land at Fadak and their share from Khaibar. Abu Bakr said to them, " I have heard from Allah's Apostle saying, 'Our property cannot be inherited, and whatever we leave is to be spent in charity, but the family of Muhammad may take their provisions from this property." Abu Bakr added, "By Allah, I will not leave the procedure I saw Allah's Apostle following during his lifetime concerning this property." Therefore Fatima left Abu Bakr and did not speak to him till she died.