كتاب الزكاة
12  
The Book of Zakat
(52)
Chapter: Gifts are permissible for the Prophet (saws) and Banu Hashim and Banu Al-Muttalib, even if the giver acquired it by way of charity. When the receipient takes possession of Charity, it is no longer described as charity, and it is permissible for anyone for whom charity is otherwise unlawful
(52)
باب إِبَاحَةِ الْهَدِيَّةِ لِلنَّبِيِّ صلى الله عليه وسلم وَلِبَنِي هَاشِمٍ وَبَنِي الْمُطَّلِبِ
Sahih Muslim 1076

Umm 'Atiyya, said:

The Messenger of Allah (ﷺ) sent me some mutton of sadaqa. I sent a piece out of that to 'A'isha. When the Messenger of Allah (ﷺ) came to 'A'isha, he said: Have you anything with you (to eat)? She said: Nothing, except only that mutton sent to us by Nusaiba (the kunya of Umm 'Atiyya) which you had sent to her. Whereupon he said: It has reached its proper place.
حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ، عَنْ خَالِدٍ، عَنْ حَفْصَةَ، عَنْ أُمِّ عَطِيَّةَ، قَالَتْ بَعَثَ إِلَىَّ رَسُولُ اللَّهِ صلى الله عليه وسلم بِشَاةٍ مِنَ الصَّدَقَةِ فَبَعَثْتُ إِلَى عَائِشَةَ مِنْهَا بِشَىْءٍ فَلَمَّا جَاءَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِلَى عَائِشَةَ قَالَ ‏"‏ هَلْ عِنْدَكُمْ شَىْءٌ ‏"‏ ‏.‏ قَالَتْ لاَ ‏.‏ إِلاَّ أَنَّ نُسَيْبَةَ بَعَثَتْ إِلَيْنَا مِنَ الشَّاةِ الَّتِي بَعَثْتُمْ بِهَا إِلَيْهَا قَالَ ‏"‏ إِنَّهَا قَدْ بَلَغَتْ مَحِلَّهَا ‏"‏ ‏.‏
Reference : Sahih Muslim 1076
In-book reference : Book 12, Hadith 227
USC-MSA web (English) reference : Book 5, Hadith 2356
  (deprecated numbering scheme)