[Avodah] Nadav and Avihu: who said it?

[rabbirichwolpoe at gmail.com]

Someone requested to find the original source for this pshat. Does anyone
know?

> ... The 2 eldest sons of Aaron were burned to death for introducing an
> alien fire into their service. This appears in the Pentateuch at least
> 4 times. The first in Leviticus 10:1
> Someone first used this source as a proof text to not add to the service
> of Hashem in general.

Is there a source stating the issue was a form of "bal tosif?"

Good Shabbos
RRW
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