Deuteronomy 21:15
Suppose a man has two wives, one whom he loves more than the other, and they both bear him sons, with the firstborn being the child of the less loved wife.
Genesis 29:33
She became pregnant again and had another son. She said, "Because the Lord heard that I was unloved, he gave me this one too." So she named him Simeon.
1 Samuel 1:4-5
Whenever the day came for Elkanah to sacrifice, he used to give meat portions to his wife Peninnah and to all her sons and daughters.
Genesis 29:18
Since Jacob had fallen in love with Rachel, he said, "I'll serve you seven years in exchange for your younger daughter Rachel."
Genesis 29:20
So Jacob worked for seven years to acquire Rachel. But they seemed like only a few days to him because his love for her was so great.
Genesis 29:30-31
Jacob had marital relations with Rachel as well. He loved Rachel more than Leah, so he worked for Laban for seven more years.