Exodus 29:34

And if ought of the flesh of the consecrations, or of the
bread, remain unto the morning
Being more than the priests could eat:

then thou shalt burn the remainder with fire;
that it might not be used in a contemptuous manner, or abused to superstitious uses; the same orders with those respecting what was left of the passover: ( Exodus 12:10 ) ,

it shall not be eaten, because it is holy;
which is the reason before given why it should not be eaten by a stranger, and being kept till the next morning it was ordered to be burnt, that it might not then be eaten at all; it was not to be given to a stranger, nor to be cast to dogs, because it had been devoted to sacred uses; and it seems as if it was not to be eaten by the priests themselves the next day, who were to live upon the daily provision made for them.