17 He must acknowledge as firstborn the son of the one who is disliked, giving him a double portion of all that he has; since he is the first issue of his virility, the right of the firstborn is his.

Matthew Henry's Commentary on Deuteronomy 21:17

Commentary on Deuteronomy 21:15-17

(Read Deuteronomy 21:15-17)

This law restrains men from disinheriting their eldest sons without just cause. The principle in this case as to children, is still binding to parents; they must give children their right without partiality.