Who is Zadok from The Source; a Novel and what is their importance?

Zadok is the leader of a tribe of seven hundred people who are ordered by the god El-Shaddai to move west. He is in his sixties and has thirty children. He and his son Epher lead their tribe to the west, to the land of the Canaanites, around Makor. They settle there in peace until they clash over religion. Many Hebrews are killed in an attack by the Canaanites. The Hebrews attack and burn Makor. Zadok dies that night and Epher, his son, becomes the new leader.