Yazid bin Kysan al-Yshkry يزيد بن كيسان اليشكري أبو إسماعيل · Funerals (Kitab Al-Jana'iz)

People with a bier passed by the Messenger of Allah (ﷺ). 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.