Chapter 45: The Book of the Merits of the Companions
' Abdullah b. Mas' ud reported Allah' s Messenger (ﷺ) as saying: If I were to choose a bosom friend I would have definitely chosen Abu Bakr as my bosom friend, but he is my brother and my companion and Allah, the Exalted and Gliorious. has taken your brother and companion (meaning Prophet himself) as a friend.
Sahih Muslim 2383a