Musannaf Ibn Abi Shaybah 25058 — The permission to write the Quran

It is narrated from al-Aswad that the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), was asked about nushrah (a treatment for possession), and she replied: What do you want with this? Here is the river Euphrates close beside you. Let one of you (come and) immerse himself in it seven times, facing the current of the water.