Jewish History: Biblical History: The Warning about the Flood:
What is the meaning of "his days will be 120 years" in Gen. 6:3?
The primary Jewish commentators explain that verse as saying that
G-d would not indefinitely postpone judging the human race for
their wickedness (see verses 5-7); but since they were only flesh
(which is weak), He would give them 120 years to repent before
punishing them (with a flood).
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