(51) باب الاِسْتِخْلاَفِ
Narrated Jubair bin Mut`im:
A woman came to the Prophet (ﷺ) and spoke to him about something and he told her to return to him. She said, "O Allah's Messenger (ﷺ)! If I come and do not find you?" (As if she meant, "...if you die?") The Prophet said, "If you should not find me, then go to Abu Bakr."
Reference: Sahih al-Bukhari 7220
In-book reference: Book 93, Hadith 80
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 89, Hadith 327