Obligatory Charity Tax (Zakat)
Bukhari :: Book 2 :: Volume 24 :: Hadith 515
Narrated Asma' bint Abu Bakr:
that she had gone to the Prophet and he said, "Do not shut your money bag; otherwise Allah too will with-hold His blessings from you. Spend (in Allah's Cause) as much as you can afford. "
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