Exodus 29:33-35

Amplified Bible, Classic Edition

³³ They shall eat those things with which atonement was made, to ordain and consecrate them; but a stranger (layman) shall not eat of them because they are holy (set apart to the worship of God).

³⁴ And if any of the flesh or bread for the ordination remains until morning, you shall burn it with fire; it shall not be eaten, because it is holy (set apart to the worship of God).

³⁵ Thus shall you do to Aaron and to his sons according to all I have commanded you; during seven days shall you ordain them.