Answer:
Moshe the Beadle.
Step-by-step explanation:
Kabbalah is the study of the mystical interpretation of the Bible, the school of thought, and the study and teaching related to this. It is a part of the Jewish tradition to learn or be introduced to this study for them to become "god-fearing" men.
In his memoir "Night", Eliezer Wiesel mentioned how he wanted to learn more and be taught. But when he asked his father to help him, he refused, saying that "He wanted to drive the idea of studying Kabbalah from my mind." Then, he found Moishe the Beadle, who became "a master", teaching him "for hours on end about the Kabbalah's revelations and its mysteries".
Thus, Moshe the Beadle introduces, teaches, and helps Eliezer about the Kabbalah.