Is it permissible to interrupt da‘wah (calling to Islam) to treat those afflicted by jinn, how is one afflicted treated, and is it permissible to take money for ruqyah (reciting Quranic verses and supplications for healing)?

Calling to Allah is a collective obligation (fard kifayah). If it becomes an individual obligation (fard ayn) for someone because no one else can take their place, then it takes precedence over ruqyah ash-shar'iyyah (Islamic exorcism), because the benefit of da'wah (calling to Allah) is certain, while the benefit of ruqyah is not certain. If it is possible to combine both, that is preferable. The lawful treatment for someone possessed is by reciting the Qur'an, such as Surah Ar-Rahman and verses that challenge the jinn, in addition to the Mu'awwidhat (Surahs Al-Ikhlas, Al-Falaq, and An-Nas), and Ayat al-Kursiy. It is also permissible to admonish the jinn and forbid them from harming Muslims. It is permissible to take money for ruqyah if it is not made a condition. If the reciter refuses to perform ruqyah except for compensation, it is permissible, as the Companions did.