Sayyiduna Fadalah bin Ubayd (may Allah be pleased with him) narrates that he heard the Messenger of Allah (peace and blessings be upon him) say: "Glad tidings to the one who is guided to Islam, whose livelihood is just sufficient, and who is content with it."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15877