Genesis 29:30-34

30So Jacob consummated his marriage and lived with Rachel [as his wife], and he loved Rachel more than Leah, and he served with Laban for another seven years.

31Now when the Lord saw that Leah was unloved, He made her able to bear children, but Rachel was barren.

32Leah conceived and gave birth to a son and named him Reuben (See, a son!), for she said, “Because the Lord has seen my humiliation and suffering; now my husband will love me [since I have given him a son].”

33Then she conceived again and gave birth to a son and said, “Because the Lord heard that I am unloved, He has given me this son also.” So she named him Simeon (God hears).

34She conceived again and gave birth to a son and said, “Now this time my husband will become attached to me [as a companion], for I have given him three sons.” Therefore he was named Levi.