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. (Using translation from Muslim 1054)
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «قَدْ أَفْلَحَ مَنْ أَسْلَمَ وَرُزِقَ كَفَافًا وَقَنَّعَهُ اللَّهُ بِمَا آتَاهُ»