An-Nefis (Arabic: النفس) appears in the form of a tall man, having the hoofs of a mule as hands. Upon him is entwined a serpent. He inhabits all rivers and streams. When he attacks his victims he causes unrelenting sleeplessness, both day and night so no rest is given, driving his victims insane.
Misceláneo de Salomón[]
Then the fortieth Tayleq (الطليق), named an-Nefis, entered in a human image. He had the head of a human and his hands were the hooves of a mule. Upon him was entwined a snake, its head protruding from behind him and its tail between his legs. Sulayman, peace be upon him, said to him, "What is your corruption? Where is your residence?" He said, "I reside in rivers. My corruption is that if I seize a person, I take him with evil, sever him from sleep, day and night, and from rest, so that no one knows the cause of his transformation." Fiqitush said, "The medicine for this, O prophet of Allah, is to write for him these names and adorn him with them, along with the oath of al-Madhab (المذهب), son of Iblis, Allah curse him. This is what you write: 'O Divine One, I turn my face to You. O Divine One, I support my back on You. O You who supports who has no support, who provides who has no provision, who props who has no prop, rescue me, O rescuer of those crying for help. By Shafaha (شفاهة), Shafaha, Frion (فريون), Barkim (بركيم), answer by the Lord of these names and the Lord of Yadmuh (يدموه), Shamusht (شمشط), Kilfish (كيلفيش), Enoch (انوخ), Ahya Sherahya (اهيا شراهيا), Sabaot (صباوت), Al Shedai (ال شداي), Holy (قدوس), Holy, Holy, Lord of Malaikah and Spirits. There is no ilah but He, to Him is the governance and He is the fastest judge. There is no strength and no power but through Allah, Most High and Supreme.'"