After the conquest of Khyber, the Jews of Fidak a neighboring settlement had surrendered without say fight. They were offered the same terms as the Jews of Khyber. The Holy Prophet took over the property of the Jews at Fidak in his personal custody. The income from the property was earmarked by the Holy Prophet for meeting his household expenses, and for looking after the needy and the wayfarer. After the death of the Holy Prophet, Ali lodged a claim before Abu Bakr for the transfer of the property of Fidak to them. Abu Bakr did not accept the claim on the ground that according to a tradition of the Holy Prophet, prophets leave no inheritance, and whatever they leave belongs to the community as a whole. Abu Bakr declared that the property in question would remain in his custody but he would utilize the income therefrom for the same purposes as was the practice of the Holy Prophet. As a part of the income would be earmarked for meeting the expenses of the household of the Holy Prophet. Fatima and Ali would have their due share. This decision did not satisfy Fatima and Ali.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari