Verse 33, Sura 33
Verse 33 of Sura 33 of the Holy Quran {33:33} reads: "Allah's wish is to remove uncleanliness far from you O'Folk of the Prophet's household, and cleanse you with enough cleaning". Ali is obviously included in the expression "Folk of the Prophet's household".
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"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