Narrated by Abu As-Samit (R.A)
One day the companions of the Prophet (pbuh) did not find him among them. (Normally) when they camped, they will lodge him in the middle (of them).

They were anxious and thinking that Allah might have selected some other companions for him.

Suddenly they saw him coming towards then and exclaimed, "Allahu Akbar!" and then they said, "O messenger of Allah! We feared that Allah must have selected for you some other companions other than ourselves".
The Prophet (pbuh) said, "No rather you are my companions in this world and the Hereafter. Indeed Allah, the  almighty, awakened me and said, ' O Muhammed! Verily,I have neither sent any messenger nor a Prophet without a wish to which I respond and now I grant you too. So O Muhammad! You should ask me something which would be given to you '

The Prophet (pbuh) said, "My wish is an intercession for my followers on the dat of Resurrection"

Abu Baker asked, " O Allah's messenger! What is an intercession?"
Muhammad (pbuh) replied, "I will say O Lord! My intercession is the pledge I have kept with you. Thereupon, the Lord will say ' yes'
Then my lord will take our the rest of my followers from Hell and Admit them in to Paradise "

(This Hadith is sound and reported by Musnad Ahmad)