Deuteronomy 21:16-18

Amplified Bible

¹⁶ then on the day when he wills his possessions to his sons, he cannot treat the son of his loved wife as firstborn in place of the son of the unloved wife—the [actual] firstborn. ¹⁷ Instead he shall acknowledge the son of the unloved as the firstborn, by giving him a double portion of all that he has, for he was the beginning of his strength (generative power); to him belongs the right of the firstborn.

¹⁸ “If any man has a stubborn and rebellious son who will not obey the voice of his father or of his mother, and when they reprimand and discipline him, he will not listen to them,