From Sahih Bukhari (Hadith 7220):
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: Bukhari 7220