What is the effect of jinn (creatures created from fire) on humans or humans on jinn and the effects of the evil eye on the envied person?
The effect of jinn on humans and humans on jinn and the effects of the evil eye on the envied person are well-known facts. But all these things happen by Allah's Kawny (universal) Will and Decree, not by His Shar`y (legislative) Will [i.e., He wills that it should happen but He does not enjoin it and He is not pleased by such actions]. As for the effects of the envier on the envied person, it is a fact known to people. It is authentically reported that the Prophet (peace be upon him) said:
The effects of an evil eye is a fact; if anything would precede destiny it would be the influence of an evil eye.
He (peace be upon him) also said:
There is no Ruqyah (reciting Qur'an and supplicating over the sick seeking healing) better than that which is said as a treatment for an evil eye or (a sting of) a venomous animal.
There are many Hadiths in this regard. We ask Allah to protect and keep us firm with the truth.May Allah grant us all success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.