Chapter 21
15
If a man has two wives, the one loved and the one hated, and they bear him sons, the loved and the hated, and the firstborn son belongs to the hated one.
16
And it will be on the day when he causes his sons to inherit what he has, he cannot make the son of the loved one firstborn ahead of the son of the hated one, the firstborn.
17
for he shall acknowledge the firstborn, the son of the hated one, to give him a double portion of all that he finds for him, for he is the firstfruits of his vigor, the judgment of the firstborn.