Exodus 29:33-35

Amplified Bible

³³ 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 [that is, set apart to the worship of God]. ³⁴ And if any of the meat of ordination or the bread remains until morning, you shall burn it in the fire; it shall not be eaten, because it is holy.

³⁵ “So you shall do to Aaron and to his sons in accordance with all I have commanded you; during seven days you are to ordain them.