Genesis 7:1-8:14
Eighty-three Hebrew verses chiastically center on a single sentence: va-yizkor Elohim et-Noach (Gen 8:1). The Flood narrative is the canonical first iteration of uncreation-and-recreation — Gen 1's cosmogonic lexicon returns inverted, the judgment-execution verbs run forward into the Red Sea at 34% coverage, and the dove-over-water of Gen 8:8-11 becomes the only canonical pair with Jesus' baptism that 1 Pet 3:21 names as antitype.
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 6:1-4
Four verses of terse Hebrew, two rare construct phrases, one verb shared with Eden, and three millennia of interpretation. Genesis 6:1-4 is the OT-side anchor of the Watchers tradition — but before any expansion, the text has its own grammar to declare.
Genesis 5, 11
The Masoretic Text's genealogical numbers place Noah's death when Abraham was 58 years old. The Septuagint's numbers put 722 years between them. Both can't be right.