Genesis 29:30-34

30So Jacob went in to Rachel also, and he loved Rachel more than Leah, and served Laban for another seven years.

31When the Lord saw that Leah was hated, he opened her womb, but Rachel was barren.

32And Leah conceived and bore a son, and she called his name Reuben, for she said, "Because the Lord has looked upon my affliction; for now my husband will love me."

33She conceived again and bore a son, and said, "Because the Lord has heard that I am hated, he has given me this son also." And she called his name Simeon.

34Again she conceived and bore a son, and said, "Now this time my husband will be attached to me, because I have borne him three sons." Therefore his name was called Levi.