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As in a person created on Passover, had a generational child on Passover and died also on Passover.
Methuseleh, the longest living man died in year 1656 from creation, the same year as the flood, and also the same year Noah turned 600 years old. The revolution of the year is Passover, for births, birthdays, and deaths of the qualifying generational patriarchs from Adam to Christ.
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Methuseleh died 7 days before the rain began, on the 10th day of the second month - - see Genesis 7.