What does Leviticus 22:15 mean?

If a priest’s daughter is married to an outsider, she shall not eat of the heave offering of the holy things.

But if a priest’s daughter is a widow, or divorced, and has no child, and has returned to her father’s house, as in her youth, she may eat of her father’s bread: but no stranger shall eat any of it.

“‘If a man eats something holy unwittingly, then he shall add the fifth part of its value to it, and shall give the holy thing to the priest.

and so cause them to bear the iniquity that brings guilt, when they eat their holy things; for I am Yahweh who sanctifies them.’”

Yahweh spoke to Moses, saying,

“Speak to Aaron, and to his sons, and to all the children of Israel, and say to them, ‘Whoever is of the house of Israel, or of the foreigners in Israel, who offers his offering, whether it is any of their vows, or any of their freewill offerings, which they offer to Yahweh for a burnt offering;