Genesis 29:30-34

30Then Jacob also went in to Rachel, and he also loved Rachel more than Leah. And he served with Laban still another seven years.

31When the Lord saw that Leah was unloved, He opened her womb; but Rachel was barren.

32So Leah conceived and bore a son, and she called his name Reuben; for she said, “The Lord has surely looked on my affliction. Now therefore, my husband will love me.”

33Then she conceived again and bore a son, and said, “Because the Lord has heard that I am unloved, He has therefore given me this son also.” And she called his name Simeon.

34She conceived again and bore a son, and said, “Now this time my husband will become attached to me, because I have borne him three sons.” Therefore his name was called Levi.