From Sahih Muslim (Hadith 6819):
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
Reference: Muslim 6819