Samurah said: "Verily Islam was in a strong fortress, and they have made in Islam a breach by their slaying of Uthman, which will not be closed till the day of resurrection. Verily the caliphate was with the people of Madina, but they have cast it forth, and it shall not return to them."
"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