Exodus 29:31-35

“Now you shall take the ram of ordination and boil its flesh in a holy place.

Then Aaron and his sons shall eat the flesh of the ram and the bread that is in the basket, at the doorway of the tent of meeting.

So they shall eat those things by which atonement was made at their ordination and consecration; but a layman shall not eat them, because they are holy.

And if any of the flesh of ordination or any of the bread remains until morning, then you shall burn the remainder with fire; it shall not be eaten, because it is holy.

“So you shall do for Aaron and for his sons, according to all that I have commanded you; you shall ordain them for seven days.