A--- Allah's Messenger (Peace be upon him) says: "The effect of an evil eye is a fact.” (Bukhari and Muslim)

Narrated Umm. Salamah (May Allah be pleased with her): That the Prophet (Peace be upon him) 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 Ruqyah.” (Bukhari and Muslim)

Narrated `A'ishah (May Allah be pleased with her): The Prophet (Peace be upon him) ordered me or somebody else to do Ruqyah (if there was danger) from an evil eye.” (Bukhari and Muslim)

He (Peace be upon him) says: "No Ruqyah is allowed but for an evil eye or fever." (Imam Ahmed)

Other narrations that go in the same vein can be found among the authentic Hadiths. But, we should know that the evil eye can not be effective unless Allah the Almighty wills. With this, the following verse was interpreted by many of our earlier scholars: {And verily, those who disbelieve would almost make you slip with their eyes (through hatred) when they hear the Reminder (the Qur'an)}. (Al-Qalam, 51)