Sahih al-Bukhari 6349
Sahih al-Bukhari · Book 80: Invocations · The invocation for death or life
Narrated Qais:
حَدَّثَنَا مُسَدَّدٌ ، حَدَّثَنَا يَحْيَى ، عَنْ إِسْمَاعِيلَ ، عَنْ قَيْسٍ ، قَالَ أَتَيْتُ خَبَّابًا وَقَدِ اكْتَوَى سَبْعًا قَالَ لَوْلاَ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَانَا أَنْ نَدْعُوَ بِالْمَوْتِ لَدَعَوْتُ بِهِ.
I came to Khabbab who had been branded with seven brands(1) and he said, "Had Allah's Messenger (ﷺ) not forbidden us to invoke (Allah) for death, I would have invoked (Allah) for it."