Deuteronomy 21 16
when the time comes for the man to decide what each son will inherit from him, he must not prefer the son of wife he loves and treat him as the firstborn instead of the son of the wife he doesn't love.
Compare with other 3 random translations
NLT Deuteronomy 21:16When the man divides his inheritance, he may not give the larger inheritance to his younger son, the son of the wife he loves, as if he were the firstborn son.
YLT Deuteronomy 21:16then it hath been, in the day of his causing his sons to inherit that which he hath, he is not able to declare first-born the son of the loved one, in the face of the son of the hated one — the first-born.
ASV Deuteronomy 21:16then it shall be, in the day that he causeth his sons to inherit that which he hath, that he may not make the son of the beloved the first-born before the son of the hated, who is the first-born: