Ali was the son of Abu Talib the uncle of the Holy Prophet. Ali was younger than the Holy Prophet by some thirty years. The Holy Prophet brought up Ali as a son. When the Holy Prophet left Makkah for Madina, Ali slept on the bed of the Holy Prophet to give the Quraish the impression that the Holy Prophet was still there. Ali fought in all the battles of Islam. He was a prodigy of valor. He was the victor of the Khyber. The Holy Prophet married his daughter Fatima to Ali. The Holy Prophet was much attached to Hasan and Hussain, the sons of Ali from Fatima
"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