Sahih al-Bukhari, Book 80, Hadith 46 (In-Book) ⓘ
Narrated Qais: I came to Khabbab who had been branded with seven brands(1) and he said, "Had Allah's Messenger not forbidden us to invoke (Allah) for death, I would have invoked (Allah) for it."
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.
also referenced under: Hadith 6349 (DarusSalam) & Volume 8, Book 75, Hadith 360 (USC-MSA)