Genesis 29:29-31

Living Bible

²⁹ And Laban gave to Rachel a servant girl, Bilhah, to be her maid. ³⁰ So Jacob slept with Rachel, too, and he loved her more than Leah, and stayed and worked the additional seven years.

³¹ But because Jacob was slighting Leah, Jehovah let her have a child, while Rachel was barren.