Exodus 29:32-34

And Aaron and his sons shall eat the flesh of the ram and the bread that is in the basket in the entrance of the tent of meeting. They shall eat those things with which atonement was made at their ordination and consecration, but an outsider shall not eat of them, because they are holy. And if any of the flesh for the ordination or of the bread remain until the morning, then you shall burn the remainder with fire. It shall not be eaten, because it is holy.