رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 578
The Book of Miscellany
Remembrance of Death and Restraint of Wishes
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: “أَكْثِرُوا ذِكْرَ هَاذِمِ اللَّذَّاتِ” ((يعنى الْمَوْتَ)) ((رَوَاهُ الترمذى وَقَالَ: حدث حَسَن)).
Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "Remember more often the destroyer of pleasures - death." [At-Tirmidhi, who classified it as Hadith Hasan].
Riyad as-Salihin, 578