What is the evidence from the Qur’an and Sunnah for treating a patient by pouring water over them?

Treatment and healing with the Holy Quran are established, and this includes reciting the Quran over water and drinking it or washing with it, as well as writing it in a vessel, then washing it with water and drinking it. A group of the Salaf permitted this, and it is narrated from them. Ibn al-Qayyim and Ibn Hajar mentioned it. The Permanent Committee for Scholarly Research and Ifta' stated in their fatwas the permissibility of healing with ruqya under three conditions: that it be with the words of Allah or His Messenger or lawful supplications; that it be in Arabic or what its meaning is known; and that both the reciter and the patient believe that this is a means that does not affect except by the decree of Allah.