Sahih al-Bukhari 1419
صحيح البخاري#1419SahihNarrated Abu Huraira:A man came to the Prophet (ﷺ) and asked, "O Allah's Messenger (ﷺ)! Which charity is the most superior in reward?" He replied, "The charity which you practice while you are healthy, niggardly and afraid of poverty and wish to become wealthy. Do not delay it to the time of approaching death and then say, 'Give so much to such and such, and so much to such and such.' And it has already belonged to such and such (as it is too late)
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: 24:23