I wondered if it was the bloodline of Seth.
Look at the Old Testament which speaks to the purpose behind Seth's birth. Seth is born to replace or be a substitute for the loss of Abel. The name Seth means "appointed" or "granted" or "substitute." Look at the scripture in context and the meaning of the name, "Seth." Seth was not just about Eve wanting another son. He was conceived or produced as a replacement. Seth is not just a name; it tells us the purpose behind his birth.
Seth and his lineage were devoted to God.

And Adam knew his wife again; and she bare a son, and called his name Seth: For God, said she, hath appointed me another seed instead of Abel, whom Cain slew.
And to Seth, to him also there was born a son; and he called his name Enos: then began men to call upon the name of the Lord
Genesis 4: 25-26