Hazrat ‘Uthmaan (radhiyallahu ‘anhu) says:

While I was in conversation with Hazrat Abu Bakr (radhiyallahu ‘anhu), it so happened that Rasulullah (sallallahu ‘alaihi wasallam) passed by. Hazrat ‘Ali (radhiyallahu ‘anhu) was with him, and Rasulullah (sallallahu ‘alaihi wasallam) had a cloth in his blessed hand. On seeing Rasulullah (sallallahu ‘alaihi wasallam), Hazrat Abu Bakr (radhiyallahu ‘anhu) stood and whispered something into his ear. Rasulullah (sallallahu ‘alaihi wasallam) then came and sat with us, after which he turned to me and said, “O ‘Uthmaan (radhiyallahu ‘anhu)! Allah invites you to Jannah, so accept His invitation! I am the messenger of Allah Ta‘ala who has been deputed to you and the entire creation.”