Hazrat Ka'b Ahbar says that when a person leaves his house and says these words: I leave the house in the name of Allah, and I have placed my trust in Allah alone, and the ability to avoid sins and to do good deeds is only from Allah, then the devils meet each other and say: This person has been guided. And he has been protected, and he has been sufficed, so you have no authority over him. Then they run away from that servant and keep away from him.