Dan and Naphtali, Gad and Asher.
When Israel dwelt there, Reuben [his eldest son] went and lay with Bilhah his father's concubine; and Israel heard about it. Now Jacob's sons were twelve.
These are the sons of Zilpah, [the maid] whom Laban gave to Leah his daughter. And these she bore to Jacob–sixteen persons all told.
Issachar, Zebulun, and Benjamin,
All the offspring of Jacob were seventy persons; Joseph was already in Egypt.