Zakat (Kitab Al-Zakat)
Dawud :: Book 9 : Hadith 1626
Narrated Ziyad ibn al-Harith as-Suda'i:
I came to the Apostle of Allah (peace_be_upon_him) and swore allegiance to him, and after telling a long story he said: Then a man came to him and said: Give me some of the sadaqah (alms). The Apostle of Allah (peace_be_upon_him) said: Allah is not pleased with a Prophet's or anyone else's decision about sadaqat till He has given a decision about them Himself. He has divided those entitled to them into eight categories, so if you come within those categories, I shall give you what you desire.