Lev 16:11 And Aaron shall bring the bullock of the sin offering, which is for himself, and shall make an atonement for himself, and for his house, and shall kill the bullock of the sin offering which is for himself:
Lev 16:12 And he shall take a censer full of burning coals of fire from off the altar before the LORD, and his hands full of sweet incense beaten small, and bring it within the vail:
Lev 16:13 And he shall put the incense upon the fire before the LORD, that the cloud of the incense may cover the mercy seat that is upon the testimony, that he die not:

Is this the reference you were thinking of?

I wonder if this is something Nadab and Abihu should have known and had previously been instructed about (this occurs in Lev 16, the strange fire happened in Lev 10). I'll have to look more closely at the beginning of Leviticus to see what their instructions were.

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Bob Howes
Framingham, MA

A reoccurring thought:

Rev 22:20 He which testifieth these things saith, Surely I come quickly. Amen. Even so, come, Lord Jesus.