Methuselah

"And about these also Enoch, [in] the seventh [generation] from Adam, prophesied, saying, "Behold, the Lord came with many thousands of His holy ones, to execute judgment upon all, and to convict all the ungodly of all their ungodly deeds which they have done in an ungodly way, and of all the harsh things which ungodly sinners have spoken against Him."
( Jude 1:14-15)
 
Methuselah comes from muth, a root that means "death"; and from shalach, which means to bring, or to send forth. The name Methuselah means, "his death shall bring"
Methuselah's father was given a prophecy of the coming Great Flood, and was apparently told that as long as his son was alive, the judgment of the flood would be withheld; but as soon as he died, the flood would be brought or sent forth.

Gen 5:21Enoch lived sixty-five years, and became the father of Methuselah. 22Then Enoch walked with God three hundred years after he became the father of Methuselah, ...

It was after Enoch received a prophecy from God about the future that he walked faithfully with God. Jude 1:14-15.

Seven days before the beginning of the Great Flood Methuselah died. Apart from having Noah give the people of the message of the flood God and graciously given them a living prove for every-time they mentioned Methuselah they knew that the day the man would die there would come destruction for the earth by flood.

Many have preached about the flood without ever mentioning the oldest man who ever lived, hiding the mercies of God of how lonhg our Lord postponed Judgement on earth. Already currenlty we are told we are on borrowed time for our Lord is coming but graciously has he extended the time.

969 years -- this were the years man was reminded of the flood and requested to repent and for 969 years men still refused to heed to the call.

The Lord says "For I have no pleasure in the death of anyone who dies," declares the Lord GOD. "Therefore, repent and live." (Ezekiel 18:32).

Matthew 24:37 ...'But as the days of Noah were, so shall also the coming of the Son of man be.'

Luke 17:28-30 ...'Likewise also as it was in the days of Lot; they did eat, they drank, they bought, they sold, they planted, they builded; But the same day that Lot went out of Sodom it rained fire and brimstone from heaven, and destroyed them all. Even thus shall it be in the day when the Son of man is revealed.'