Genesis 29:30-34
English Standard Version
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.