Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:7418a
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السيوطي:٧٤١٨a

"إِنَّ هذِهِ الصدقاتِ إِنَّما هى أَوساخُ النَّاسِ، وأَنَّها لا تحِلُّ لمحمَّدٍ ولا لآل محمَّدٍ".  

[م] مسلم [د] أبو داود [ن] النسائي عن عبد المطلب بن ربيعة

See similar narrations below:

Collected by Mālik, Suyūṭī
malik:58-13Mālik > Balaghah

Yahya related to me from Malik that he heard that the Messenger of Allah ﷺ said, "Sadaqa to the family of Muhammad is not halal. It is only people's impurities."  

مالك:٥٨-١٣حَدَّثَنِي عَنْ مَالِكٍ أَنَّهُ بَلَغَهُ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ تَحِلُّ الصَّدَقَةُ لآلِ مُحَمَّدٍ إِنَّمَا هِيَ أَوْسَاخُ النَّاسِ