Exodus 6:14

These be the heads of their fathers' houses: The sons of Reuben the firstborn of Israel; Hanoch, and Pallu, Hezron, and Carmi: these be the families of Reuben.

These be the heads - chiefs or governors of their houses. The insertion of this genealogical table in this part of the narrative was intended to authenticate the descent of Moses and Aaron. Both of them were commissioned to act so important a part in the events transacted in the court of Egypt, and afterward elevated to so high offices in the government and Church of God that it was of the utmost importance that their lineage should be accurately traced. Reuben and Simeon being the oldest of Jacob's sons, a passing notice is taken of them, and then the historian advances to the enumeration of the principal persons in the house of Levi.