The Messenger of Allah ﷺ used to command us to give charity, but none of us could find anything to give until he would go to the marketplace and carry loads on his back, bringing back a mudd of food which he would then give to the Messenger of Allah ﷺ. Indeed, I know a man today who has a hundred thousand, yet on that day he did not possess a single dirham.
أخبرنا الحسين بن حريث قال أنبأنا الفضل بن موسى عن الحسين عن منصور عن شقيق
كان رسول الله ﷺ يأمرنا بالصدقة فما يجد أحدنا شيئا يتصدق به حتى ينطلق إلى السوق فيحمل على ظهره فيجيء بالمد فيعطيه رسول الله ﷺ إني لأعرف اليوم رجلا له مائة ألف ما كان له يومئذ درهم
No references are available.
See the following hadith. It is also in Al-Kubra, no. 2308. Husayn is the son of Waqid.