Hatif

Hatif () is a voice that can be heard without one's discovering the body that made it.
Pre-Islamic Arabs credited jinn with such "hatif" avenging murder on a fellow jinn by driving the murderer insane.
Al-Jahiz wrote that the Bedouin believed the jinn could be used as transmitters of important messages. The receiver would hear the message in realtime without seeing the speaker. He stated that belief in Hatif was widespread among the Bedouin, and they would be perplexed that people could disbelieve in it. Al-Masudi focused on the psychological backgrounds of this phenomenon, and explained the Hatif as a hallucination caused by loneliness.
In some cases, the voice does not come from jinn, but from ghosts, dwelling near graves and remember humans about their mortality or announce their death.