Exodus 29:32-34

New Revised Standard Version, Anglicised Catholic Edition

³² and Aaron and his sons shall eat the flesh of the ram and the bread that is in the basket, at the entrance of the tent of meeting. ³³ They themselves shall eat the food by which atonement is made, to ordain and consecrate them, but no one else shall eat of them, because they are holy. ³⁴ If any of the flesh for the ordination, or of the bread, remains until the morning, then you shall burn the remainder with fire; it shall not be eaten, because it is holy.