Favoritism: Jacob, for Rachel
Source: Nav
Genesis 29:30, 34
Jacob slept with Rachel as well, and indeed, he loved Rachel more than Leah. So he worked for Laban another seven years. / Once again Leah conceived and gave birth to a son, and she said, “Now at last my husband will become attached to me, because I have borne him three sons.” So he was named Levi.