Hadith 945 - Bab 160 (Admonition beside the Grave)
Chapter 7 (The Book of Visiting the Sick)

`Ali (May Allah be pleased with him) reported: We were accompanying a funeral procession in Baqi` Al-Gharqad (graveyard in Al-Madinah) when the Messenger of Allah (Peace be upon him) proceeded towards us and sat down. We sat around him. He had a small stick in his hand. He was bending down his head and scraping the ground with the stick. He said, "There is none among you but has a place assigned for him either in the Jannah or in the Hell." The Companions said: "O Messenger of Allah, should we not depend upon what has been written for us (and give up doing good deeds)?'' The Messenger of Allah (Peace be upon him) said, "Carry on doing good deeds. Every one will find it easy to do such deeds (as will lead him to his destined place) for which he has been created."

[Al-Bukhari and Muslim].