Genesis 6:9-22
The toledot of Noah opens with the first canonical tsaddiq, runs through the only OT verse where atonement-noun and atonement-verb co-occur, makes the first canonical covenant, and closes with a sentence that recurs nearly word-for-word when Moses finishes the tabernacle. The Hebrew lexicon discloses Noah's ark as the canonical first iteration of the covenant-sanctuary-atonement cycle the rest of the Old Testament builds out.
Genesis 5:1-32
Genesis 5 is the chapter where the fall's vocabulary becomes a family vocabulary. Ten generations descend under a metronomic formula — lived, fathered, lived more, died — until the formula breaks twice: at Enoch, who does not die, and at Lamech, who names his son Noah using the same word God used for the pain of the curse eight generations earlier.