Ruqya is incantations or recitation said over a person who is possessed (suffering from Black Magic, evil eye, Jinn Possession)
These recitations should be using Quranic verses and they should be intelligible statements in concordance to Quran and sunnah.
The most common Ruqya is the ‘Manzil‘.
The most simplest Ruqya is Surah Fatiha.
There are the 45-Verses against sehr that can be recited onto water to fight sorcery.
One can address the Jinn and ask it to leave by the will of Allah.
One can curse the jinn, As Prophet Muhammad (pbuh) recited: “Auzobilla hai mink… Al-anak bi-Lahna tilla (still to be edited)
Abu Sa`id Al-Khudri (May Allah be pleased with him) reported: Jibril (Gabriel) came to the Prophet (sallallaahu ’alayhi wa sallam) and said: “O Muhammad (sallallaahu ’alayhi wa sallam)! Do you feel sick?” He (sallallaahu ’alayhi wa sallam) said, “Yes.” Jibril supplicated thus (i.e., he performed Ruqyah): “Bismillahi arqika, min kulli shay’in yu’dhika, min sharri kulli nafsin aw `ayni hasidi, Allahu yashfika, bismillahi arqika. [With the Name of Allah. I recite over you (to cleanse you) from all that troubles you, and from every harmful mischief and from the evil of the eyes of an envier. Allah will cure you; and with the Name of Allah, I recite over you].”