God kills Nadab and Abihu
God killed Aaron’s sons Nadab and Abihu for worshiping improperly. Moses told Aaron and his other sons not to mourn.
Key passages
Le 10:1–7

And Aaron’s sons Nadab and Abihu each took his censer, and they put fire in them and placed incense on it; then they presented before Yahweh illegitimate fire, which he had not commanded them. So fire went out from before Yahweh, and it consumed them so …