Kindly refer to the following link(s):
Blaming all on evil eye, Can Raqi tell who did black magic,How to do Ruqya on others?
Ruling on doubting Muslims/relatives of doing black magic etc? Can we eat from such people?
Boycott relatives that do black magic?
Blaming everything on black magic, evil eye or Jinn possession
Ruqyah for Evil Eye, Black Magic, etc.