Deuteronomy 21:15
"If a man has two wives, [and] the one [is] loved and the [other] one [is] disliked and the one loved and the one that is disliked have borne for him sons, if it happens [that] the firstborn son {belongs to the one that is disliked},
Genesis 29:33
And she conceived again and gave birth to a son. And she said, "[It is] because Yahweh has heard that I [am] unloved that he gave me this [son] also." And she called his name Simeon.
1 Samuel 1:4-5
{On} the day Elkanah sacrificed, he would give portions to his wife Peninnah and to all her sons and daughters.
Genesis 29:18
And Jacob loved Rachel and said, "I will serve you seven years for Rachel your younger daughter."
Genesis 29:20
And Jacob worked for Rachel seven years, but they were as a few days in his eyes because he loved her.
Genesis 29:30-31
Then he also went in to Rachel, and he loved Rachel more than Leah. And he served with him yet another seven years.