A lot has been said and heard about the effect of Black Magic, Evil Eye (Nazar) and Envy (Hasad) and its effect on human beings, so much so that people have been destroyed or weakened with its effect. This is not just hearsay or a false belief. It mention is there in Quran and the Hadiths. The verses pertaining to them will leave you stunned. I will make this very simple to understand and quote simple relevent verses from Quran and Hadith.
Allah informs us about magic in the Holy Quran as follows:
"And when there came to them a Messenger from Allah confirming what was with them, a party of those who were given the scripture threw away the book of Allah behind their backs as if they did not know. And they followed what the devils gave out falsely of magic of the reign of Solomon; for Solomon did not disbelieve but the devils disbelieved, teaching men magic and such things that came down at Babylon to the two angels Harut and Marut, but neither of these two (angles) taught anyone (such things) until they had said: we are only for trial, so don't disbelieve. And from them (magicians) people learn that through which they would cause separation between a person and his spouse, but they could not thus harm anyone except by Allah's leave; and they learn that which harms them rather than profits them. And indeed they knew that its practitioner would have no share in the Hereafter. And how bad indeed was that for which they sold their own selves if they but knew". (QURAN 2:101-2)
The Messenger of Allah (peace and blessings of Allah be with him) said : 'The effect of the evil eye is true, if anything were to alter destiny, it would be the evil eye, and when you are told to bathe from the effect of an evil eye, you should do so'. - Hadith Sahih Muslim (Book of Healing)
For Islamic purposes, the use of specialized prayers (duaa) or Qur'anic verses are known as ruqyah. The Prophet, sallallahu alayhe wa sallam, and his companions used this method of healing, as evidenced by many ahadeeth in Bukhari, Muslim, Abu Dawud, Tirmithi and others. Muslims are advised to provide ruqiyah for Muslims and even non-Muslims that are sick. The sick are also able to provide ruqiyah for themselves. Ruqyah is a valuable tool for treating a variety of disorders and diseases. This may include snake or scorpion bite, the evil eye (or envy), and psychological problems that Jinn may cause.
Hadrat Ayesha (May Allah be pleased with her) is reported to have said : Whenever The Messenger of Allah (peace and blessings of Allah be with him) suffered from an ailment, Angel Gabriel (peace be upon him) used to perform Ruqyah upon him, saying : 'In the name of Allah, He relieves you from every ailment, and from the evil of every envier when we envies and from the evil of every eye' - Hadith Sahih Muslim (Book of Healing)
The Prophet (peace and blessings of Allah be with him) used to seek refuge from the jinn as well as from the evil eye until Surah al Falaq and An Naas were revealed. When they were sent down, he utilised them and left other things. - Hadith Tirmidhi
Hazrat Ayesha (May Allah be pleased with her) narrates:
"Whenever the Messenger of Allah (Allah bless him & give him peace) would become ill, he would recite the Mu'awwizat (Surah al-Falaq and Surah an-Nas) and blow over himself. When his illness was aggravated, I used to recite these two Surahs and blow my breath over him and make him rub his body with his own hand, for its blessings." (Hadith Sahih al-Bukhari No. 4728)
Narrated Um Salama:
That the Prophet saw in her house a girl whose face had a black spot. He said. "She is under the effect of an evil eye; so treat her with a Ruqya." - Hadith Sahih Muslim
Surah Falaq and Surah Naas are mainly used for cure from Jinns and evil eye and magic. Both the Surah's are embedded for better understanding with meaning. Those who find Surah Falaq difficult to learn and recite, the simplest form of learning is embbeded from Utube here.
Apart from these Surahs, there are several Surahs which help in healing from Illness and other evils like Ayat- Al Kursi and Surah Fatiha.
Recite Ayat-ul-Kursi, Surah Fatiha, Surah Falaq and Surah Naas frequently (not in the form of wazeefa). This is the most important part. Recite these surahs sitting, standing, walking etc. They are the swords against magic, jinn possession and evil eye. Be very persistent in reciting them because if you are able to accomplish this, you WILL feel the difference. Ayat ul kursi is one of the most powerful verses of Quran. Jinns cannot perform any of their activites while the victim is busy reciting Ayat Al kursi. There comes a time when the jinns will give up and leave as the client due to his frequent recitation of Ayat-Al-kursi, will create a hurdle for their activites.
May The Almighty save us from all evil and harm. Remember that doing magic or casting evil on another is an unpardonable sin.