The sons of Leah Jacob's first wife, which are six, and are reckoned in order, according to their birth, Reuben, Simeon, Levi, Judah, Issachar, Zebulun.
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And Israel journeyed and spread his tent beyond the tower of Edar.
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And it came to pass when Israel dwelt in that land, that Reuben went and lay with Bilhah, his father’s concubine, and Israel heard of it. Now the sons of Jacob were twelve:
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The sons of Leah: Reuben, Jacob’s firstborn, Simeon, Levi, Judah, Issachar, and Zebulun.