Obligatory Charity Tax (Zakat)
Bukhari :: Book 2 :: Volume 24 :: Hadith 517
Narrated Hakim bin Hizam:
I said to Allah's Apostle, "Before embracing Islam I used to do good deeds like giving in charity, slave-manumitting, and the keeping of good relations with Kith and kin. Shall I be rewarded for those deeds?" The Prophet replied, "You became Muslim with all those good deeds (Without losing their reward)."
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