Jinns’ contact with humans
Question

                Is there any real contact between humans and jinn? Is it true that a jinni can possess a person and speak on his lips, or not?.
Praise be to Allah.
    Yes, it is proven that the jinn can possess 
    humans and harm them. Allaah says concerning those who deal in riba 
    (interpretation of the meaning): 

    “Those who eat Riba will not stand (on 
    the Day of Resurrection) except like the standing of a person beaten by 
    Shaytaan (Satan) leading him to insanity”

    [al-Baqarah 2:275]

    i.e., when they rise from their graves at 
    the Resurrection, they will only stand like one who has been possessed by 
    the jinn because the belly of the one who deals in riba – Allaah forbid – 
    will be huge, so when he wants to stand up he will fall down, and every time 
    he wants to stand up he will fall down and be exposed before all people, so 
    he is likened to the possessed man who has been overcome by the jinn and 
    devils. This indicates that the jinn can possess humans, which is something 
    that is proven and well known from visible experience. The jinn can enter 
    humans and possess them, causing them to go insane, either because the human 
    has harmed them and they want to take revenge on him, or because they are 
    toying with him, or for some other purpose that they are seeking. 

    To sum up: it is proven that the jinn can 
    harm humans by possessing them, and this is indicated by the Qur’aan and by 
    visible experience that no one can deny but one who is ignorant. 

    The best means of dealing with that is 
    reciting Qur’aan over the one who is affected, and treating him with ruqyah 
    that contains du’aa’s narrated from the Prophet  (peace and blessings of 
    Allaah be upon him), and what he is suffering will disappear, in sha 
    Allaah. 

    As for what some charlatans and liars do 
    nowadays, such as prescribing some du’aa’s and drinks, claiming that this 
    will bring the jinni out of the body of the person, the basic principle is 
    that this is haraam and it is not permissible to treat such cases except 
    with du’aa’s from Qur’aan and Sunnah. End quote.