The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness
Ṣaḥīḥ Muslim 6819
لاَ يَتَمَنَّى أَحَدُكُمُ الْمَوْتَ وَلاَ يَدْعُ بِهِ مِنْ قَبْلِ أَنْ يَأْتِيَهُ إِنَّهُ إِذَا مَاتَ أَحَدُكُمُ انْقَطَعَ عَمَلُهُ وَإِنَّهُ لاَ يَزِيدُ الْمُؤْمِنَ عُمْرُهُ إِلاَّ خَيْرًا
lā yatamannā aḥadukumu al-mawta walā yadʿu bihi min qabli an yaʾtiyah innah idhā māta aḥadukumu ānqaṭaʿa ʿamaluhu wa-innah lā yazīdu al-muʾmina ʿumruhu illā khayran
Transliteration generated from the Arabic vowel marks
The full narration
Hammam b. Munabbih said:Abu Huraira narrated to us ahadith from Allah's Messenger (ﷺ) and out of these one is that Allah's Messenger (ﷺ) said: None amongst you should make a request for death, and do not call for it before it comes, for when any one of you dies, he ceases (to do good) deeds and the life of a believer is not prolonged but for goodness
Source
Ṣaḥīḥ Muslim · 6819