The Umayyads versus the Hashimites
It appears that most of the accounts of the period were written when the Umayyads had wrested power from the Hashimites. Because of the rivalry between the Umayyads and the Hashimites, most of the writers during the Umayyad period tried to create the impression that the Hashimites were not good managers, and that the financial position of Abu Talib had deteriorated because of his inefficiency. This view is uncharitable. The Muslims are under great obligation to Abu Talib for his guardianship of the Holy Prophet and for his support of Islam, and such views which cast an indirect aspersion on Abu Talib have to be rejected because of the bias of the writers.
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"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
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Sahih Bukhari