"For whereas the names of the generations were reckoned in Israel either according to nature or according to law;— according to nature by the succession of legitimate offspring, and according to law whenever another raised up a child to the name of a brother dying childless; for because a clear hope of resurrection was not yet given they had a representation of the future promise by a kind of mortal resurrection, in order that the name of the one deceased might be perpetuated;—
3. whereas then some of those who are inserted in this genealogical table succeeded by natural descent, the son to the father, while others, though born of one father, were ascribed by name to another, mention was made of both of those who were progenitors in fact and of those who were so only in name. -Eusebus
