Nadav and Avihu were two of the greatest Tzaddikim of their generation. In a strange story, the Torah tells us that they died upon bringing Ketores that they were not commanded to bring. Is this sin punishable by death? Why were they consumed by a fire from Heaven? In this shiur, Rav Burg teaches the inner meaning of this story and expounds upon what it means to build a passionate relationship with Hashem.