Dybuk.

In a Polish-Jewish village, pious student Chanan, captivated by Kabbalah, falls in love with Leah, the rabbi’s daughter, but is forbidden to wed her and dies invoking the Ineffable Name - returning as a dybbuk (possessing spirit) at her wedding. Only after a mystical “trial” reveals a centuries-old vow binding their souls does the revered Rabbi Azriel exorcise the dybbuk, freeing both Leah and the restless spirit.