LXX2012(i)
15 And if a man have two wives, the one loved and the other hated, and both the loved and the hated should have born him [children], and the son of the hated should be firstborn;
16 then it shall be that whenever he shall divide by inheritance his goods to his sons, he shall not be able to give the right of the firstborn to the son of the loved one, having overlooked the son of the hated, which is the firstborn.