Sahih al-Bukhari 5351
صحيح البخاري#5351SahihNarrated Abu Mas`ud Al-Ansari:The Prophet (ﷺ) said, "When a Muslim spends something on his family intending to receive Allah's reward it is regarded as Sadaqa for him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 69:1