If one is possessed by a Jinn, then what is the halaal method to cure that person?
First of all it depends upon the level of the illness. If that person is able to have patience, then there is a lot of reward for that. There is a hadeeth of Prophet Muhammed (ﷺ) that once a woman came to him and said, "Inni asraa." That means she was suffering from seizures and she asked the Prophet (ﷺ) to make dua' for her.The Prophet (ﷺ) said ,
" In shi'ti da'utilaki wa in shi'ti fasbiri lakil janna." ,
that is, if you wish, I will make dua' for you and you will be cured and if you wish to be patient then you will have jannah.” 
Then the woman said that she would be patient. No matter what she was suffering with, she preferred Jannah because she knew that this life is temporary.
But her concern was greater than that. She said,
"O Messenger of Allah, whenever I am in a state of epilepsy or possession, I cannot control myself and shed off my clothing (she exposes herself."
So the Prophet (ﷺ) made dua' for her that it would not happen. So, if a person wants to be patient, then there is great reward for it.
There is also another hadeeth that someone who does not seek ruqya would be of the seventy thousand who are granted Jannah.
But there is also evidence that seeking help by ruqya is permissible like the hadeeth mentioned in Sahih Bukhari  that once the Sahabas, while travelling. one of them was affected and he asked one of the Sahabas to make ruqya on him. It wasn't for jinn, but he was stung by a scorpion. But the point is that he asked for ruqya and the Sahaba did ruqya on him. This message went to the Prophet (ﷺ) and he affirmed what the Sahaba did. So if a person seeks help through someone who has knowledge and does ruqya then its alright.
 (Sahih al-Bukhari 5652)
 (Sahih al-Bukhari 5737)< Back to Questions