Sahih Bukhari Volume 9, Book 87, Hadith Number 138.

Narrated By Qais bin ‘Ubada : I was sitting in a gathering in which there was Sa’d bin Malik and Ibn ‘Umar. ‘Abdullah bin Salam passed in front of them and they said, “This man is from the people of Paradise.” I said to ‘Abdullah bin Salam, “They said so-and-so.” He replied, “Subhan Allah! They ought not to have said things of which they have no knowledge, but I saw (in a dream) that a post was fixed in a green garden. At the top of the post there was a handhold and below it there was a servant. I was asked to climb (the post). So I climbed it till I got hold of the handhold.” Then I narrated this dream to Allah’s Apostle. Allah’s Apostle said, “‘Abdullah will die while still holding the firm reliable handhold (i.e., Islam).”