In Jewish folklore, a dybbuk is a malicious possessing spirit, believed to be the dislocated soul of a dead person.
Dybbuks are said to have escaped from Gehenna (a Hebrew term loosely analogous to the concept of hell) or to have been turned away from Gehenna for serious transgressions, such as suicide, for which the soul is denied entry. The word "dybbuk" is derived from the Hebrew דיבוק, meaning "attachment"; the dybbuk attaches itself to the body of a living person and inhabits the flesh. According to belief, a soul that has been unable to fulfill its function during its lifetime is given another opportunity to do so in dybbuk form. It supposedly leaves the host body once it has accomplished its goal, sometimes after being helped.
[u]Exorcising a dybbuk[/uIn Hasidic tradition, a particularly powerful miracle-working rabbi known as a baʿal shem (master of the name) could expel even the most evil dybbuk through a rite of exorcism. However, exorcism of a dybbuk today normally normally involves nine Jews plus the rabbi. The ceremony is not normally one of overpowering the dybbuk, but of first shocking it, and then dialoging with it in an attempt to cause it to see that it needs to leave.
The group surrounds the possessed victim and repeatedly recites the comforting, protective verses of Psalm 91. The rabbi proceeds to blow a shofar (ram's horn trumpet) in a specific pattern. This "shocks" both the possessed person and the dybbuk, causing a loosening between the two which enables each entity to be addressed separately. Once this is accomplished, the rabbi enters into a dialog with the dybbuk to discover its purpose. The group then proceeds to heal it through dialog and prayer, and this is also done for a person who is possessed. Sometimes the legitimate needs of the dybbuk must be satisfied before it agrees to leave.
While many Jews today no longer accept the idea of dybbuks and their influence, in some communities, especially (but not only) among Hasidic Jews, ceremonies to liberate people from dybbuk possession are still performed
Thsi amulet is believed to be among others great protection against Dybbuks and various demons