Narrated Sa'd bin Abi Waqqas: Allah's Messenger (ﷺ) said, "You will be rewarded for whatever you spend for Allah's sake even if it were a morsel which you put in your wife's mouth."
The chain is ordered from the source of the saying to the compiler: 1 = the speaker/first transmitter, the following links those who passed it on in turn, and at the bottom al-Bukhari who compiled the work. Click a narrator to list every hadith in which he appears; the number in parentheses is how many hadiths across the collections on this site the narrator appears in.