Leviticus 21:3

Modern English Version

and his virgin sister (who is near him because she has not had a husband), for her he may be made unclean.

See the chapter Copy

but for his closest relatives, that is, for his mother, his father, his son, his daughter, his brother,

And he shall not make himself unclean as a husband among his people because of the dead and so defile himself.

If the priest’s daughter marries an outsider, she may not eat of an offering of the holy things.