The Book of Zakat (Kitab Al-Zakat)
Muslim :: Book 5 : Hadith 2356
Umm 'Atiyya, said: The Messenger of Allah (may peace be upon him) sent me some mutton of sadaqa. I sent a piece out of that to 'A'isha. When the Messenger of Allah (may peace be upon him) came to 'A'isha, he said: Have you anything with you (to eat)? She said: Nothing, except only that mutton sent to us by Nusaiba (the kunya of Umm 'Atiyya) which you had sent to her. Whereupon he said: It has reached its proper place.