At Tabarani records on the authority of Asma b Malik that when Umm Kulsum died, the Holy Prophet advised the Muslims: "Give your daughters in marriage to Uthman . If I had a third daughter I would assuredly give her in marriage to him, and I have never wedded any to him save under inspiration".
Ibn Asakir records on the authority of Ali that the Holy Prophet said: "If I had forty daughters, I would wed them with Uthman one after the other until not one of them is left".
"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