Sahih al-Bukhari 6445
صحيح البخاري#6445SahihNarrated Abu Huraira:Allah's Apostle said, "If I had gold equal to the mountain of Uhud, it would not please me that anything of it should remain with me after three nights (i.e., I would spend all of it in Allah's Cause) except what I would keep for repaying debts
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: 81:34