12-27, Kenan, Mahalalel, Jared, Enoch, Methuselah, Lamech, shows that it is a slightly different version of the Cainite genealogy, iv.
METHUSELAH, in the Old Testament, the seventh in descent from Adam, and father of Lamech.
This work called forth a host of imitators, and a number of their writings, together with the groundwork, were edited as a Book of Methuselah, i.e.
Then came the final redactor, who interpolated the groundwork and the Methuselah sections, adding two others from his own pen.
Methuselah asks Enoch's blessing before he departs, and to all his sons and their families Enoch gives fresh instruction.
It is not the work of a single author, but rather a conglomerate of literary fragments which once circulated under the names of Enoch, Noah and possibly Methuselah.