Deuteronomy 21:15
"If a man have two wives, one beloved, and another hated, and they have born him children, both the beloved and the hated; and if the firstborn son be hers that was hated:"
Cross References (ranked by relevance)
Genesis 29:33
And she conceived again, and bare a son; and said, Because the LORD hath heard that I was hated, he hath therefore given me this son also: and she called his name Simeon.
Genesis 29:20
And Jacob served seven years for Rachel; and they seemed unto him but a few days, for the love he had to her.
Genesis 29:18
And Jacob loved Rachel; and said, I will serve thee seven years for Rachel thy younger daughter.