Fiqh-us-Sunnah Volume 4, Funerals and Dhikr, Fiqh 4.008.

The use of incantation and supplications is allowed for treatment, provided their content is the remembrance of Allah and they are written in a comprehensible language. Otherwise their content might well contain something polytheistic without one being aware of it. ‘Awf ibn Malik reported: “We practiced incantation in the pre-islamic days so we asked the Messenger of Allah, ‘What is your opinion about it?’ He said: ‘Let me see your incantations.

There is nothing wrong with the incantation that does not contain any polytheistic statements’.” (Muslim and Abu Daw-ud)

Ar-Rabi’ says: “I asked Ash-Shafi’i about incantation. He replied: ‘There is nothing wrong in using the Qur’an for incantation or any other words that contain Allah’s remembrance.’ Then I asked him: ‘Is it permissible for Muslims to approach the Christians and the Jews for incantation?’ Ash-Shafi’i replied: ‘Yes, provided they use the revelation from Allah and words that contain His remembrance’.”