'Preference' in the Bible

" 'You shall not do injustice in judgment; {you shall not show partiality to the powerless}; you shall not give preference {to the powerful}; you shall judge your fellow citizen with justice.

[nevertheless] {it will be the case that} on the day of bestowing his inheritance upon his sons, he will not be allowed to treat as [the] firstborn son the son of the beloved [wife] {in preference to} the son of the disliked [wife], [who is] the firstborn [son].