Leviticus 22:10

No layman, however, is to eat the holy gift; a sojourner with the priest or a hired man shall not eat of the holy gift.

1 Samuel 21:6

So the priest gave him consecrated bread; for there was no bread there but the bread of the Presence which was removed from before the Lord, in order to put hot bread in its place when it was taken away.

Matthew 12:4

how he entered the house of God, and they ate the consecrated bread, which was not lawful for him to eat nor for those with him, but for the priests alone?

Exodus 29:33

Thus 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.

Treasury of Scripture Knowledge

Summary

There shall no stranger eat of the holy thing: a sojourner of the priest, or an hired servant, shall not eat of the holy thing.

The word zar, a stranger, does not mean one of another nation, a foreigner, which is expressed by hechar, but one who is not of the seed of aaron, or does not belong to his family

General references

Bible References

The word zar, a stranger, does not mean one of another nation, a foreigner, which is expressed by hechar, but one who is not of the seed of aaron, or does not belong to his family

1 Samuel 21:6
So the priest gave him consecrated bread; for there was no bread there but the bread of the Presence which was removed from before the Lord, in order to put hot bread in its place when it was taken away.
Matthew 12:4
how he entered the house of God, and they ate the consecrated bread, which was not lawful for him to eat nor for those with him, but for the priests alone?

General references

Exodus 12:45
A sojourner or a hired servant shall not eat of it.