Every normal cell of the body.
Well since I'm a Muslim I only know about Muslims so,
Satan whispers to a human and tells them to do bad so u could disobey god, but u can't hear his whisper, it's like ur thinking it yourself, he convinces u to do bad things and once u do it u get a sin. Satan will always whisper to a person until they die and so there is no running away or hiding from him.
The requirements are in the Constitution.
