Eastern European Jews have an expression keyn ayin horeh, which can be translated from Yiddish into Russian as "chur me"). Ashkenazi Jews for many centuries were most afraid of meeting with Ibburs (spirits). Well, the dybbuk was the most terrible Ibbur.
"Dibbuk" is translated from Hebrew as "stuck". It is an evil spirit in Ashkenazi Jewish folklore that is the soul of a deceased evil person.
The dybbuk soul cannot part with earthly existence because of serious crimes and sins committed by a person, for example, if a person committed suicide. Dibbuki have been mentioned in Kabbalistic literature since the 17th century.
Many Jews believed that spirits are transmigrating souls that cannot enter a new bodily shell because of their past sins, and therefore are forced to enter the bodies of living people. Moreover, the spirits were involuntarily forced to enter the physical shells of people, otherwise they were tortured by other evil spirits. Some believed that the dibbuki were the souls of people who did not receive a proper burial and therefore turned into demons.
Here is what Henry Lyon Oldie wrote about this dark creature in Heroes' Refuge. “Dybbuk, aka psycho-twin,“sculpted”in jargon. In search of shelter, the dybbuk strives to settle into a human body, but hides and rarely climbs outside, unlike active spirits who push the possessed around as they want.
Interestingly, even today many Orthodox Jews believe in the existence of dibbuk.
Dibbuk is expelled by the tzaddik (righteous man) and ten other members of the Jewish community, who are dressed in funeral shirts. During the exorcism of the dibbuk, aromatic substances are burned, prayers are read and the shofar is blown. Dibbukov can be related to demons and spirits, which in the Catholic Church are exorcised through the rite of exorcism. The most difficult thing is to identify the dibbook and agree with him on the conditions under which the spirit will agree to leave the "captured" body. The ritual prescribes reading Bible verses backwards, blowing the shofar and repeating tsey, tsey, dybbuk! ("Begone, be gone, dybbuk!"). Interestingly, in Israel today, some offer the service of exorcising a dibbook via skype.