After the death of the Holy Prophet, Abdullah b Masud migrated to Syria and there participated in the various border campaigns against the Byzantines. During his caliphate, Umar appointed him as the Qadi and the treasurer of the Baitul Mal at Kufa. Abdullah b Masud was an authority on the Holy Quran, and at Kufa he established a school where he lectured on the Quran. He was scrupulously honest and enjoyed great fame as an eminent Muslim and a religious scholar.
"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