Deuteronomy 21:15

When a man has two wives, one beloved and the other hated, and they have born him sons, both the beloved and the hated; and if the firstborn son is of the one that was hated,

Genesis 29:33

And she conceived again and gave birth to a son; and said, Because the LORD has heard that I was hated, he has therefore given me this son also; and she called his name Simeon.

1 Samuel 1:4-5

And when the day would come, Elkanah would sacrifice, and he would give portions to Peninnah his wife and to all her sons and her daughters.

Genesis 29:18

And Jacob loved Rachel and said, I will serve thee seven years for Rachel, thy younger daughter.

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 29:30-31

And he went in also unto Rachel, and he loved also Rachel more than Leah and served with him yet another seven years.

Treasury of Scripture Knowledge

Summary

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:

Bible References

Two wives

Genesis 29:18
And Jacob loved Rachel and said, I will serve thee seven years for Rachel, thy younger daughter.
1 Samuel 1:4
And when the day would come, Elkanah would sacrifice, and he would give portions to Peninnah his wife and to all her sons and her daughters.