Deuteronomy 21:16-18

New Revised Standard Version Catholic Edition

¹⁶ then on the day when he wills his possessions to his sons, he is not permitted to treat the son of the loved as the firstborn in preference to the son of the disliked, who is the firstborn. ¹⁷ He must acknowledge as firstborn the son of the one who is disliked, giving him a double portion^[a] of all that he has; since he is the first issue of his virility, the right of the firstborn is his.

Rebellious Children

¹⁸ If someone has a stubborn and rebellious son who will not obey his father and mother, who does not heed them when they discipline him,