Anas (bin Malik) reported Allah’s Messenger (peace be upon him) as saying:

“None of you should make a request for death because of the trouble in which he is involved, but if there is no other help to it, then say: ‘O Allah, keep me alive as long as there is goodness in life for me and bring death to me when there is goodness in death for me.’ ”

[Sahih Muslim,Hadith: 2680]