Musannaf Ibn Abi Shaybah 31599 — A man frightened at night: what

Yahya bin Ja'dah said that Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) used to be frightened at night, so much so that he would go out with his sword. Fear came over him that he might hurt someone, so he complained of this to the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) said: "Jibril has said to me that a demon from among the jinn is plotting against you, so recite these words: 'I seek refuge in the perfect Words of Allah, which neither the righteous nor the wicked can go beyond, from the evil of everything that descends from the sky and everything that rises in it, from the evil of everything that is created on the earth and everything that comes out of it, from the evil of the trials of the day and the night, and from every night-comer except one who brings good, O Most Merciful.'" So Sayyiduna Khalid recited these words, and this condition of his went away.