Abu Dawud
Funerals
Book Number: 014 / Hadith Number: 3227
Narated By AbuHurayrah : People with a bier passed by the Apostle of Allah (pbuh). They (the companions) spoke highly of him. He said: Paradise is certain for him. Then some people with another (bier) passed by him. They spoke very badly of him. He said: Hell is certain for him. He then said: Some of you are witness to others.