The Revelation
Some time after Abu Bakr and trio party had left for the Hajj, the Holy Prophet received revelation about the regulation of the Hajj, and the ordering of relationship between the Muslims and the infidels. It is related that when the revelation came some one suggested to the Holy Prophet that he should send news about the revelation to Abu Bakr. The Holy Prophet said only a man of his own house could proclaim the revelation.
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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
"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