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Understanding How a Jinn Enters, Where It Stays, and What Weakens It
A jinn does not usually enter the body without a cause. It enters through specific doors: magic sent by a magician, a strong evil eye, accumulated hasad (envy), or a person's moments of weakness (times of intense anger or fear).
The Messenger of Allah, peace and blessings be upon him, said that Shaytan flows through a person's body like the flow of blood (Bukhari 2039, Muslim 2175) — meaning that his influence becomes entangled with the blood and the nervous system, not like sitting in one particular organ.
Raqis have observed that a jinn usually stays in the head, wanting to control thoughts and waswasa (whispers); stays in the chest to cause shortness of breath and restlessness; and stays in the back or stomach to weaken the whole body.
Inside the body, a jinn is nourished through the sins a person commits. Abandoning daily dhikr, listening to obscene songs, quarrels and excessive anger, and the continuing effect of magic — each of these increases its place and strength.
When verses (ayahs) of the Qur'an are recited, especially verses about magic and jinn, it feels intense pain — because it is a wrongdoer and a transgressor, and its nature cannot bear the pure words of Allah.
Fear of the magician's punishment, attachment to the body from staying a long time, and taking advantage of the patient's mental and physical weakness — these are the reasons that keep it in the body. But it is important to remember that it has no real authority over a believer.
Strong and regular ruqyah, holding firmly to the morning and evening adhkar, closing the doors of sin, taking the right steps to undo magic, evil eye and hasad if they are present, and firm faith and certainty — when all of these are applied together, its downfall begins and it is forced to give up its place.
It enters through one cause and stays through one cause. When all the doors of entering and staying are closed, by Allah's will it has no existence left. It is not stronger than you; it only takes advantage of weakness.