The Prophet ﷺ said, "Upon every limb of the children of Adam there is a charity due."
حدثنا هوذة قال حدثنا عوف عن خلاس
عن النبي ﷺ قال على كل عضو من أعضاء بني آدم صدقة
No references are available.
Its isnad is sahih. Muslim narrated it, 1/499 and 720, in the book of the prayer of travelers, chapter on the recommendation of the Duha prayer, and Abu Dawud, 4/362, no. 5243, in the book of manners, chapter on removing harmful things, and Ibn Khuzayma, 2/229, no. 1225.