Devarim 21:16-18

Orthodox Jewish Bible

¹⁶ Then it shall be, on the yom when he wills his possessions to his banim, that he may not make the ben of the beloved bechor before the ben of the hated, which is indeed the bechor;

¹⁷ But he shall acknowledge the ben of the hated for the bechor, by giving him a double portion of all that he hath; for he is the beginning of his strength; the mishpat habechorah (right of the firstborn) is his.

¹⁸ If an ish have a stubborn and rebellious ben, which will not obey the voice of his av, or the voice of his em, and that, when they have chastened him, will not give heed unto them;