The names Methuselah, Lamech, Adam, and Seth appear in the Bible's Book of Genesis, chapter 5, as part of the genealogy tracing the line from Adam to Noah.
This lineage represents the descendants through Seth, often called the Sethite line.
Second, in one common interpretation, the "sons of God" refer to the godly descendants of Seth (including figures like Methuselah and Lamech), who intermarried with the ungodly line of Cain, leading to corruption.
Seth, Adam’s son, lived for 912 years.
Enosh, Seth’s son, lived for 905 years.
3 And Adam lived an hundred and thirty years, and begat a son in his own likeness, after his image; and called his name Seth:
4 and the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters:
6 And Seth lived an hundred and five years, and begat Enos:
7 and Seth lived after he begat Enos eight hundred and seven years, and begat sons and daughters:
8 and all the days of Seth were nine hundred and twelve years: and he died.
And the Humans cohabited with the Ishshah still and brought forth aliens and called their name Seth, and the Elohiym regarded the foreign seed as beneath Abel because Cain killed them.
And Seth the same; brought forth aliens and called their name Enos and began to proclaim the name the YHWH.
And We-it bore another son, Seth, in place of Abel, whom Cain slew.