Narrated Anas bin Malik: The Prophet Muhammad (peace be upon him) said, “None of you should wish for death because of a calamity befalling him; but if he has to wish for death, he should say: “O Allah! Keep me alive as long as life is better for me, and let me die if death is better for me.’ ”
[Sahih Al-Bukhari – Book 70 Hadith 575]