The Messenger of Allah ﷺ said, "Wealth is not having many possessions. True wealth is the richness of the soul."
وقال رسول الله ﷺ ليس الغنى عن كثرة العرض ولكن الغنى غنى النفس
This is also sahih, and it is in the Individual Copy, number 61. The two sheikhs did not narrate it through the route of the Copy. Bukhari narrated it, 11:231-232 Fath, from the hadith of Abu Salih from Abu Hurairah. Muslim narrated it, 1:286 Bulaq edition, through the route of the copy of Aaraj from Abu Hurairah, and it has already passed as 7314, through the route of the copy of Aaraj. It has also already passed as 7546, through the narration of Abu Salama from Abu Hurairah.