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:New International Version
when he wills his property to his sons, he must not give the rights of the firstborn to the son of the wife he loves in preference to his actual firstborn, the son of the wife he does not love.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