Their answer is both clever and chilling: The wilderness of Sinai was where they received their death sentence.
How could that be? The key, it seems, lies in Exodus 24:11: “Against the noble of the children of Israel, He did not extend His hand.” Rabbi Pinchas explains that this verse actually implies that they deserved punishment. The question becomes: what did they do to deserve it?
Rabbi Hoshaya cuts to the chase: "Did cakes go up with them to Sinai that you say: “They beheld God and ate and drank”?" (Exodus 24:11). In other words, were they there to worship or to have a divine picnic? He suggests that they were essentially feasting their eyes on the Divine Presence, treating the encounter with God with a shocking lack of reverence. As Rabbi Yochanan puts it, it was like actual nourishment, like "Life is in the light of the king’s countenance" (Proverbs 16:15).
Rabbi Tanhuma adds another layer, accusing them of arrogance: standing upright and brazenly staring at the Divine Presence.
Now, compare this behavior to that of Moses. Rabbi Yehoshua of Sikhnin, quoting Rabbi Levi, contrasts Moses’ humility with the Israelites' audacity. Moses, as it says in Exodus 3:6, "concealed his face, because he feared to look at God." Yet, paradoxically, he benefited from the Divine Presence, as Exodus 34:29 tells us: “Moses did not know that his face was radiant upon His speaking with him.” The Midrash beautifully connects these verses: in reward for his fear, the people later "feared to approach him" (Exodus 34:30). And in reward for his humility in averting his gaze ("to look [mehabit]"), he was privileged to "behold [yabit] the image of the Lord" (Numbers 12:8). It's a lesson in the power of reverence and humility.
What about Nadav and Avihu, the sons of Aaron, who also experienced a moment of Divine encounter? The Midrash states that they, like the nobles, "feasted their eyes on the Divine Presence and received no benefit from it." But why weren't they punished immediately?
The Midrash offers a fascinating analogy: A king marrying off his daughter discovers a groomsman behaving disgracefully. Does he punish him right away? No. To do so would ruin his daughter's wedding celebration. Instead, he waits for his own celebration.
Similarly, the Holy One, Blessed be He, delayed the punishment of the nobles (and presumably Nadav and Avihu). Punishing them immediately would have marred the celebration of the giving of the Torah at Sinai. God would wait for His own "celebration"— the dedication of the Ohel Mo'ed (Tent of Meeting). As it says in Song of Songs 3:11, "'On the day of his wedding,' this is Sinai, 'and on the day of the rejoicing of his heart,' this is the Tent of Meeting.”
So, what does all this mean? It's a reminder that encounters with the Divine demand reverence, humility, and a recognition of our own limitations. It's also a testament to God's patience and the delicate balance between justice and mercy. And it all started with a seemingly simple phrase: "In the wilderness of Sinai." Who knew so much could be hidden within?