Genesis 29:29-31 Holman Christian Standard Bible (HCSB)
29 And Laban gave his slave Bilhah to his daughter Rachel as her slave. 30 Jacob slept with Rachel also, and indeed, he loved Rachel more than Leah. And he worked for Laban another seven years.
31 When the Lord saw that Leah was unloved, He opened her womb; but Rachel was unable to conceive.