Sahih al-Bukhari 6350
Sahih al-Bukhari · Book 80: Invocations · The invocation for death or life
Narrated Qais:
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى ، حَدَّثَنَا يَحْيَى ، عَنْ إِسْمَاعِيلَ ، قَالَ حَدَّثَنِي قَيْسٌ ، قَالَ أَتَيْتُ خَبَّابًا وَقَدِ اكْتَوَى سَبْعًا فِي بَطْنِهِ فَسَمِعْتُهُ يَقُولُ لَوْلاَ أَنَّ النَّبِيَّ صلى الله عليه وسلم نَهَانَا أَنْ نَدْعُوَ بِالْمَوْتِ لَدَعَوْتُ بِهِ.
I came to Khabbab who had been branded with seven brands over his `Abdomen, and I heard him saying, "If the Prophet: had not forbidden us to invoke (Allah) for death, I would have invoked Allah for it."