Narrated Ibn 'Umar:
that the Messenger of Allah (ﷺ) said to Abu Bakr: "You are my companion at the Hawd, and my companion in the cave." (JA)
English reference (JA): Vol. 1, Book 46, Hadith 3670 (JA)
Arabic reference (JA): Book 49, Hadith 4033 (JA)