The Messenger of Allah was seated in a gathering with the Sahaabah* when he looked towards the entrance and said, “A man of Paradise is coming.” At that instance someone who seemed to be very ordinary entered the mosque where they were seated. A Sahaabi was curious as to why the Prophet said this, so he followed the man to his house. This Sahaabi told the man that he was a traveler and wished to stay as his guest. For three days the Sahaabi watched but saw nothing unusual, so he finally told the man what the Prophet had said and asked him what was so special. The man thought for a long time and said, “There might be one thing — before going to sleep every night I forgive everyone and sleep with a clean heart."
The Sahaabah were the Companions of the Prophet, salaalahu alayhi wa salaam.