Obligatory Charity Tax (Zakat)

Bukhari :: Book 2 :: Volume 24 :: Hadith 572

Narrated Anas:

Some meat was presented to the Prophet (p.b.u.h) and it had been given to Barira (the freed slave-girl of Aisha) in charity. He said, "This meat is a thing of charity for Barira but it is a gift for us."