Reward for saying: There is no God except Allah (Laa ilaaha illallaah)

3. The Messenger of Allah صلى الله عليه وعلى آله وسلم said: Prompt your departed ones to say: ‘There is no god except Allah’ for it erases the sins. So they asked: O Messenger of Allah صلى الله عليه وعلى آله وسلم, what if one recites this when one is healthy (alive)? The Holy Prophet صلى الله عليه وعلى آله وسلم replied, “This (utterance) destroys the sins and finishes them off in any condition. Indeed “There is no God except Allah” is a friend and helper of man in life in death and in raising after death. The Messenger of Allah صلى الله عليه وعلى آله وسلم also said: Jibraeel said: O Muhammad! You shall see them when they are raised with shining countenances those who used to chant: There is no God except Allah and Allah is the greatest.” And those shall be black faced who used to say: “Woe be to you, you are ruined!”