Musnad Ahmad 1210:4

Abu Mu'awiyah narrated to us, he said: Hajjaj narrated to us, from Al-Rabi' ibn Malik, from Khawlah bint Hakim, she said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Whoever stops at a place and says: 'I seek refuge in the perfect words of Allah, all of them, from the evil of what He created,' nothing in that place will harm him until he departs from it."