Narrated Anas ibn Malik: The Prophet (salallahu 'alaihi wassalam) said: When a man goes out of his house and says: "In the name of Allah, I trust in Allah; there is no might and no power but in Allah," the following will be said to him at that time: "You are guided, defended and protected." The devils will go far from him and another devil will say: How can you deal with a man who has been guided, defended and protected? [Hadith from Sunan Abu Dawud, Book No. 41: Kitab al-Adab, Hadith No. 5076].