Original Verse:
Deuteronomy Chapter 21 Verse 15If a man have two wives, the one beloved, and the other hated, and they have borne him children, both the beloved and the hated; and if the first-born son be hers that was hated;

Reference Verses:
Genesis Chapter 29 Verse 30-31 [30] And he went in also unto Rachel, and he loved also Rachel more than Leah, and served with him yet seven other years. [31] And Jehovah saw that Leah was hated, and he opened her womb. But Rachel was barren.
Genesis Chapter 29 Verse 33And she conceived again, and bare a son: and said, Because Jehovah hath heard that I am hated, he hath therefore given me this [son] also. And she called his name Simeon.
Genesis Chapter 29 Verse 30And he went in also unto Rachel, and he loved also Rachel more than Leah, and served with him yet seven other years.
1st Samuel Chapter 1 Verse 4And when the day came that Elkanah sacrificed, he gave to Peninnah his wife, and to all her sons and her daughters, portions: