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According to the general books of Islamic history the conquest of Spain is attributed to Tariq b Ziyad and Musa b Naseer in 711 - 712 C.E. in the time of the Umayyad Caliph Walid b Abdul Malik. According to Tabari, Spain was conquered some sixty years earlier during the caliphate of Uthman
"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