TT #38 · Parshas Shemini · Aliyah 3 · Passuk 2
Chabad.org — Vayikra Chapter 10 with Rashi
Eruvin 63a.
E-Daf.com — Eruvin 63a (Tsurras Hadaf)
English: “And they died.” Rabbi Eliezer teaches that the sons of Aharon did not die until they issued a halachic ruling before Moshe; they reasoned that even though heavenly fire descends, there is a mitzvah to bring fire from the human realm.
Halachic derivation — the Chazal derives the teaching from the wording or structure of the verse.
Rabbi Eliezer teaches that Nadav and Avihu did not die until they issued a ruling in the presence of Moses; their teaching concerned bringing fire from the human realm even though heavenly fire descends.