The Book of Zakat (Kitab Al-Zakat)
Muslim :: Book 5 : Hadith 2213
This hadith has been narrated through another chain of transmitters with a change of words. In the hadith transmitted Rauh (the words are):" Out of the honest earning and its spending at what is its (due) right" ; and in the hadith transmitted by Sulaiman (the words are):" And its spending at its proper place."