Shared ground
Leviticus 10:1–3 portrays a failure by insiders at the very center of Israel’s worship. Nadab and Abihu bring an incense offering using “unauthorized” fire—explicitly described as something Yahweh “had not commanded.” The story then reports an immediate reversal of the prior chapter’s joyful sign: fire comes from Yahweh’s presence and kills them (compare the acceptance-sign in Leviticus 9:23–24).
Moses interprets the event with a remembered divine saying: those who “come near” Yahweh must treat him as set apart, and Yahweh will be honored publicly “before all the people.” Aaron’s silence closes the scene, signaling the weight of the moment without giving a spoken protest or explanation.
Where interpretation differs
The main uncertainty is what made the fire “unauthorized.” The passage states the key problem (not commanded) but does not specify which rule was broken.
Some argue the offense was primarily the source of the coals (taking fire from somewhere other than the approved altar fire). Others argue it was the timing or setting (entering/acting at the wrong moment or in the wrong place). Others see it as self-directed ritual innovation more generally: acting as if close access to Yahweh allows improvisation.
A second, smaller difference concerns Moses’ words in v. 3: some read them as a direct quotation of an earlier, known statement from Yahweh; others as Moses summarizing the principle that this event demonstrates.
Why the disagreement exists
The narrator identifies the offering as “unauthorized” and explains it with one reason (“not commanded”), but gives no further detail about location, timing, or coal source. That gap invites readers to connect the episode to other priestly instructions about incense and holy space found elsewhere in the Torah, but Leviticus 10:1–3 itself does not spell out which connection is decisive.
What this passage clearly contributes
Textually, the passage links three ideas: (1) approaching Yahweh in priestly service is real nearness with real danger; (2) worship in Yahweh’s presence is bounded by what he has commanded, not by personal initiative; and (3) Yahweh’s holiness and public honor are not only beliefs but are displayed in how “near ones” handle sacred duties. The narrative also shows that leadership actions in sacred space can have immediate, communal significance (“before all the people”), even when the direct judgment falls on the leaders themselves.