Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “Remember often the destroyer of pleasures,” by which he meant death.

Source: Sunan ibn Majah 4258

Grade: Sahih (authentic) according to Al-Albani

عَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَكْثِرُوا ذِكْرَ هَاذِمِ اللَّذَّاتِ يَعْنِي الْمَوْتَ

4258 سنن ابن ماجه كتاب الزهد باب ذكر الموت والاستعداد له

المحدث الألباني خلاصة حكم المحدث حسن صحيح

http://dailyhadith.abuaminaelias.com/2012/09/13/hadith-on-death-recommendation-to-frequently-remember-death-the-destroyer-of-pleasures/