Sunan Ibn Majah, Chapter: The Chapters on Supplication

"I heard the Messenger of Allah (saw) say: "There is no person who says, in the morning and evening of every day: Bismillahil-ladhi la yadurru ma'a ismihi shay'un fil-ardi wa la fis-sama'i wa Huwas-Sami'ul-Alim (In the name of Allah with Whose Name nothing on earth or in heaven harms, and He is the All-Seeing, All-Knowing), three times, and is then harmed by anything.'" (Hasan)He (one of the narrators) said: "Aban had been stricken with paralysis on one side of his body, and a man started looking at him. Aban said: 'Why are you looking at me? The Hadith is as I have narrated it to you, but I did not say it that day, so that the decree of Allah might be implemented.'"