King James Version
Then it shall be, when he maketh his sons to inherit that which he hath, that he may not make the son of the beloved firstborn before the son of the hated, which is indeed the firstborn:English Standard Version
then on the day when he assigns his possessions as an inheritance to his sons, he may not treat the son of the loved as the firstborn in preference to the son of the unloved, who is the firstborn,Catholic Public Domain Version
and if he wishes to divide his substance among his sons: he cannot make the son of the beloved wife the firstborn, and so prefer him before the son of the hated wife