Proof of the Jinn Entering a Person's Body

Question :

Is there any proof that supports the claim that jinn can possess human beings?

Answer:

Yes, there is proof in the Book and the Sunnah that jinn enter humans. In the Qur'an, Allâh Almighty says:
"Those who eat Riba (usury and interest) will not stand (on the Day of Resurrection) except like the standing of a person beaten by Shaytan leading him to insanity."

Ibn Kathir, may Allah have mercy upon him, commented: "They will rise from their graves like a person rises who is possessed by the Shaytan."

Regarding proof from the Sunnah, the Messenger of Allah ﷺ said:
"Indeed, Shaytan flows through the son of Adam like the flow of his blood."

In Maqalat Ahl As-Sunnah wal-Jama'ah, Al-Ash'ari said that they - meaning Ahl As-Sunnah say that the jinn enter into the body of the possessed as proven by the preceding verse.

'Abdullah, Imam Ahmad's son, said, "I said to my father that a group of people claimed that jinn don't enter into the bodies of human beings. He said, 'O my son, they are lying; don't you see that it is they who are speaking upon their tongues."

In a number of Hadiths from the Messenger of Allah, recorded by Imam Ahmad and Al-Bayhaqi, it is reported that he met a boy who was possessed. So the Prophet ﷺ began saying:
"Come out, O enemy of Allah. Come out, O enemy of Allah."

In some versions he ﷺ said:
"Come out, O enemy of Allah, for I am the Messenger of Allah."

Then the boy healed and became normal.

Here we have mentioned one proof from the Qur'an and two from the Sunnah; what people witness everyday serves as tangible evidence, not to mention that this is the view of Ahl As- Sunnah wal-Jama'ah. Nevertheless, we do not deny that some people are insane due to some other defect in their mind.