Leviticus 10:1-3

But Nadab and Abihu, the sonnes of Aaron, tooke either of them his censor, and put fire therein, and put incense thereupon, and offred strange fire before the Lord, which hee had not commanded them.

Therefore a fire went out from the Lord, and deuoured them: so they dyed before the Lord.

Then Moses sayde vnto Aaron, This is it that the Lord spake, saying, I will bee sanctified in the that come neere me, and before all the people I will be glorified: but Aaron held his peace.