رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 469
The Book of Miscellany
Excellence of Leading an Ascetic Life, and Virtues of Simple Life
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الدُّنْيَا سِجْنُ الْمُؤْمِنِ وَجَنَّةُ الْكَافِرِ ((رَوَاهُ مُسْلِم)).
Abu Hurairah (May allah be pleased with him) reported: Messenger of Allah (ﷺ) said: "The world is the believer's prison and the infidel's Jannah". [Muslim].
Riyad as-Salihin, 469