Hadith 23839
It is narrated from Hazrat Waleed bin Waleed (may Allah be pleased with him) that once he submitted in the court of the Messenger (peace and blessings be upon him), "O Messenger of Allah! Sometimes I feel an unknown fear." The Noble Prophet (peace and blessings be upon him) said, "When you lie down on your bed, recite these words: 'A'udhu bikalimaatillahi-t-taammaati min ghadabihi wa 'iqaabihi wa sharri 'ibaadihi wa min hamazaatish-shayaateeni wa an yahduroon.' Nothing will be able to harm you, rather, nothing will even come near you."