حَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ لاَ تَحِلُّ الصَّدَقَةُ لآلِ مُحَمَّدٍ إِنَّمَا هِيَ أَوْسَاخُ النَّاسِ ‏"‏ ‏.‏

Yahya related to me from Malik that he heard that the Messengerof Allah, may Allah bless him and grant him peace, said, "Sadaqa tothe family of Muhammad is not halal. It is only people's impurities." Translation Not Available

Book Ref: Muwatta Imam Malik Book 58 Hadith 1856
Web Ref:  Muwatta Imam Malik Book 58 Hadith 13