“If a man has two wives, the one loved and the other unloved, and both the loved and the unloved have borne him children, and if the firstborn son belongs to the unloved,
She conceived again and bore a son, and said, “Because the Lord has heard that I am hated, he has given me this son also.” And she called his name Simeon.
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,