Sunan Ibn Majah, Book 37, Hadith 4276 (In-Book) ⓘ
It was narrated from Abu Hurairah that the Messenger of Allah said: “Richness is not an abundance of worldly goods, rather richness is contentment with one’s lot.”
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لَيْسَ الْغِنَى عَنْ كَثْرَةِ الْعَرَضِ وَلَكِنَّ الْغِنَى غِنَى النَّفْسِ " .
also referenced under: Hadith 4137 (Reference) & Volume 5, Book 37, Hadith 4137 (DarusSalam)