Al-Mu'jam al-Awsat 5415 — I used to be seized by fear and alarm

Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) narrates: "I used to be seized by fear and alarm at night. So I came to the Prophet (peace and blessings be upon him) and said: 'I get alarmed at night, so I take hold of my sword, and whatever I come across I strike with my sword.' The Messenger of Allah (peace and blessings be upon him) said: 'Shall I not teach you some words which the Trustworthy Spirit (Jibril, peace be upon him) taught me?' I said: 'Yes, certainly.' He (peace and blessings be upon him) said: 'Say: A'udhu bi-kalimatillah al-tammati allati la yujawizuhunna barrun wa la fajir, min sharri ma yanzilu min al-sama'i wa ma ya'ruju fiha, wa min sharri fitan al-layli wa al-nahar, wa min kulli tariqin illa tariqan yatruqu bi-khayr, ya Rahman (I seek refuge in the perfect words of Allah, which neither a righteous person nor a wicked one can go beyond, from the evil of what comes down from the sky and what ascends into it, and from the evil of the trials of the night and the day, and from every night-visitor, except a visitor who comes with good, O Most Merciful).'" Then he recited these words, and that condition of his left him.
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Hisham bin Hassan except al-Mughirah bin Muslim, and Shababah is alone in narrating it from him."