Genesis 29:31-34

When the LORD saw that Leah was hated, he opened her womb, but Rachel was barren. And 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.” She 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. Again 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.