The Levites: Descended from Jacob's Third Son

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.

And so to speak, Levi, who collects the tenth, paid the tenth through Abraham.

For when Melchizedek met Abraham, Levi was still in the loin of his ancestor.