Riyad as-Salihin

Fadalah bin 'Ubaid Al-Ansari (May Allah be pleased with him) reported: I heard Messenger of Allah (ﷺ) say: "Happiness is due to him who is guided to Islam and possesses provision that suffices him for his day and remains content."

[At- Tirmidhi, who classified it as Hadith Hasan Sahih].