Language:
كتاب الإجارة
37  
Hiring
(13)
Chapter: To employ himself to carry loads, and the wages of porters
(13)
باب مَنْ آجَرَ نَفْسَهُ لِيَحْمِلَ عَلَى ظَهْرِهِ. ثُمَّ تَصَدَّقَ بِهِ وَأُجْرَةِ الْحَمَّالِ
Sahih al-Bukhari 2273

Narrated Abu May' id Al-Ansari:

Whenever Allah's Messenger (ﷺ) ordered us to give in charity we would go to the market and work as porters to earn a Mudd (two handfuls) (of foodstuff) but now some of us have one-hundred thousand Dirhams or Diners. (The sub-narrator) Shaqiq said, "I think Abu Mas`ud meant himself by saying (some of us) .

حَدَّثَنَا سَعِيدُ بْنُ يَحْيَى بْنِ سَعِيدٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، عَنْ شَقِيقٍ، عَنْ أَبِي مَسْعُودٍ الأَنْصَارِيِّ ـ رضى الله عنه ـ قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا أَمَرَ بِالصَّدَقَةِ انْطَلَقَ أَحَدُنَا إِلَى السُّوقِ فَيُحَامِلُ فَيُصِيبُ الْمُدَّ، وَإِنَّ لِبَعْضِهِمْ لَمِائَةَ أَلْفٍ، قَالَ مَا نُرَاهُ إِلاَّ نَفْسَهُ‏.‏
Reference : Sahih al-Bukhari 2273
In-book reference : Book 37, Hadith 13
USC-MSA web (English) reference : Vol. 3, Book 36, Hadith 473
  (deprecated numbering scheme)