"Go to the Messenger of Allah and say to him: 'O Messenger of Allah, appoint us to collect the Sadaqat!' 'Ali bin Abi Talib came along when we were like that, and he said to them: "The Messenger of Allah will not appoint any of you to collect the Sadaqah."' 'Abdul-Muttalib said: "So I went with Al-Fadl until we came to the Messenger of Allah and he said to us: "This Zakah is the dirt of the people, and it is not permissible for Muhammad or for the family of Muhammad."' (Using translation from Nasāʾī 2609)  

لِعَبْدِ الْمُطَّلِبِ بْنِ رَبِيعَةَ وَلِلْفَضْلِ بْنِ عَبَّاسٍ ائْتِيَا رَسُولَ اللهِ ﷺ فَقُولَا اسْتَعْمِلْنَا يَا رَسُولَ اللهِ عَلَى الصَّدَقَاتِ فَأَتَى عَلِيُّ بْنُ أَبِي طَالِبٍ وَنَحْنُ عَلَى تِلْكَ الْحَالِ فَقَالَ لَنَا إِنَّ رَسُولَ اللهِ لَا يَسْتَعْمِلُ مِنْكُمْ أَحَدًا عَلَى الصَّدَقَةِ قَالَ عَبْدُ الْمُطَّلِبِ وَانْطَلَقْتُ أَنَا وَالْفَضْلُ حَتَّى أَتَيْنَا رَسُولَ اللهِ ﷺ فَقَالَ لَنَا «إِنَّ هَذِهِ الصَّدَقَةَ إِنَّمَا هِيَ أَوْسَاخُ النَّاسِ وَإِنَّهَا لَا تَحِلُّ لِمُحَمَّدٍ وَلَا لِآلِ مُحَمَّدٍ»