كتاب الإمارة
33  
The Book on Government
(7)
Chapter: The prohibition of giving gifts to agents
(7)
باب تَحْرِيمِ هَدَايَا الْعُمَّالِ ‏‏
Sahih Muslim 1832 e

It has been narrated on the authority of Abu Humaid as-Sa'idi that the Messenger of Allah (ﷺ) appointed a man in charge of Sadaqa (authorising him to receive charity from the people on behalf of the State). He came (back to the Holy prophet) with a large number of things and started saying:

This is for you and this has been presented to me as a gift. Here follows the tradition that has gone before except that 'Urwa (one of the narrators in the chain of transmitters) asked Abu Humaid: Did you hear it from the Messenger of Allah (himself) (ﷺ)? He replied: My ears heard it from his mouth.
وَحَدَّثَنَاهُ إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا جَرِيرٌ، عَنِ الشَّيْبَانِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ ذَكْوَانَ، - وَهُوَ أَبُو الزِّنَادِ - عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم اسْتَعْمَلَ رَجُلاً عَلَى الصَّدَقَةِ فَجَاءَ بِسَوَادٍ كَثِيرٍ فَجَعَلَ يَقُولُ هَذَا لَكُمْ وَهَذَا أُهْدِيَ إِلَىَّ ‏.‏ فَذَكَرَ نَحْوَهُ قَالَ عُرْوَةُ فَقُلْتُ لأَبِي حُمَيْدٍ السَّاعِدِيِّ أَسَمِعْتَهُ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَ مِنْ فِيهِ إِلَى أُذُنِي ‏.‏
Reference : Sahih Muslim 1832e
In-book reference : Book 33, Hadith 41
USC-MSA web (English) reference : Book 20, Hadith 4513
  (deprecated numbering scheme)