Genesis 29:31-34

When the LORD saw that Leah was not loved, he enabled her to conceive, but Rachel remained childless. Leah became pregnant and gave birth to a son. She named him Reuben, for she said, “It is because the LORD has seen my misery. Surely my husband will love me now.” She conceived again, and when she gave birth to a son she said, “Because the LORD heard that I am not loved, he gave me this one too.” So she named him Simeon. Again she conceived, and when she gave birth to a son she said, “Now at last my husband will become attached to me, because I have borne him three sons.” So he was named Levi.