'Unmarried' in the Bible

Watch when the unmarried women from Shiloh come out to participate in the dances. Then come out of the vineyards and each of you grab a wife from the unmarried women from Shiloh. Then go back home to the territory of Benjamin.

They are not to come in contact with a dead body, so they don't defile themselves, except in the case of their father, mother, son, daughter, brother, or for an unmarried sister, on whose behalf they may defile themselves.