“The bull for the sin offering and the goat for the sin offering, whose blood was brought in to make atonement in the Holy Place, shall be carried outside the camp, and their hides, their flesh, and their dung burned with fire.
the entire bull—he is to carry outside the camp to a clean place, where the fat ashes are poured out, and burn it over wood in the fire. It is to be burned on top of the place of pouring fat ashes.
“A clean man is to gather up the ashes of the heifer and put them in a clean place outside the camp. They are to be for the community of Bnei-Yisrael to use as water of purification from sin.
But Nadab and Abihu died before Adonai for offering unauthorized fire before Adonai in the Sinai wilderness—they had no children. So Eleazar and Ithamar served as kohanim under Aaron their father.