The Book of Zakat
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو عَبْدِ الرَّحْمَنِ الْمُقْرِئُ، عَنْ سَعِيدِ بْنِ أَبِي، أَيُّوبَ حَدَّثَنِي شُرَحْبِيلُ، - وَهُوَ ابْنُ شَرِيكٍ - عَنْ أَبِي عَبْدِ الرَّحْمَنِ الْحُبُلِيِّ، عَنْ عَبْدِ اللَّهِ، بْنِ عَمْرِو بْنِ الْعَاصِ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " قَدْ أَفْلَحَ مَنْ أَسْلَمَ وَرُزِقَ كَفَافًا وَقَنَّعَهُ اللَّهُ بِمَا آتَاهُ " .Amr b. al-'As reported Allah's Messenger (ﷺ) as saying:He Is successful who has accepted Islam, who has been provided with sufficient for his want and been made contented by Allah with what He has given him
From Sahih Muslim, whose reports the scholars accept as authentic.