(83) بَابُ مَرَضِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَوَفَاتِهِ
Narrated `Aisha:
I heard the Prophet (ﷺ) and listened to him before his death while he was leaning his back on me and saying, "O Allah! Forgive me, and bestow Your Mercy on me, and let me meet the (highest) companions (of the Hereafter)." (See the Qur'an (4:69) and Hadith #4435)
Reference: Sahih al-Bukhari 4440
In-book reference: Book 64, Hadith 461
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 59, Hadith 724