‘Abd al-Muttalib b. Rabi'a reported God’s messenger as saying, “These <i>sadaqat</i> are only people’s impurities,* and they are not lawful for Muhammad or Muhammad’s family.” Muslim transmitted it. * i.e. an atonement for their sins.

وَعَنْ عَبْدِ الْمُطَّلِبِ بْنِ رَبِيعَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «إِن هَذِهِ الصَّدَقَاتِ إِنَّمَا هِيَ أَوْسَاخُ النَّاسِ وَإِنَّهَا لَا تَحِلُّ لِمُحَمَّدٍ وَلَا لِآلِ مُحَمَّدٍ» . رَوَاهُ مُسلم