Why were Aaron’s two older sons punished for offering unholy fire?

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Aaron Aaron, detail of a 3rd-century fresco from the synagogue at Doura-Europus, Syria; in the National Museum, Damascus

In the biblical narrative, Aaron’s two older sons were consumed by fire from God because they offered "unholy fire" during their priestly service.1

This account, found in the Book of Leviticus, serves to emphasize the critical importance of strictly adhering to the precise cultic regulations and rituals established by God for the Aaronic priesthood. By highlighting the severe consequences of failing to follow these divine instructions, the narrative reinforces the authority and sanctity of the priestly duties performed at the tabernacle.1