Jinn entering human bodies is a reality
and if the possessed person is ordered to do unlawful things; they should stick to Shari`ah and disobey the Jinn even if they are harmed. The possessed person should seek refuge with Allah (Exalted be He) from the evils of Jinn and protect themselves by reciting the Qur'an, Shari`ah incantations, and the Adhkar (forms of Remembrance of Allah) which have been established by the Prophet (peace be upon him). Amongst the ways of making Dhikr is to say the Ruqyah (reciting Qur'an and saying supplications over the sick seeking healing) with Surah Al-Fatihah, or (Part No. 1; Page No. 284) Surahs of Al-Ikhlas and Al-Mu`awwidhatayn (Surahs Al-Falaq and Al-Nas); then blow into one's hands and rub the face and body therewith as far as they can reach and then to repeat this process three times. All other forms of Ruqyah with Surahs (chapters) of the Qur'an, its Ayahs (verses), and authentic Adhkar can be used while asking Allah Alone for healing and protection from devils amongst Jinn and humans. You may refer to the books of Al-Kalim Al-Tayyib by
Ibn Taymiyyah, Al-Wabil Al-Sayyib by
Ibn Al-Qayyim, and Al-Adhkar by
Al-Nawawy to know more about the different types of Ruqyah.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.