Musannaf Ibn Abi Shaybah 25093 — Those who permitted hanging

Amr bin Shu'ayb narrates from his father, from his grandfather, that the Messenger of Allah (peace and blessings be upon him) said: "When one of you is frightened in his sleep, let him say (the following): I seek refuge in the perfect words of Allah Almighty from Allah's anger and evil punishment, from the evil of His servants, and from the evil of the devils and of whatever is present." So Sayyiduna Abdullah (may Allah be pleased with him) used to teach these words to those of his children who had understanding, and for the children who had no understanding, Sayyiduna Abdullah (may Allah be pleased with him) would write these words and hang them (around their necks).