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.
21
Then Jacob traveled on and camped beyond Migdal-eder.
22
While he was living there, Reuben had intercourse with Bilhah, his father’s concubine, and Jacob soon heard about it. These are the names of the twelve sons of Jacob:
23
The sons of Leah were Reuben (Jacob’s oldest son), Simeon, Levi, Judah, Issachar, and Zebulun.