During the time of old world, Noah, a preacher of righteousness warned that generation of the coming great flood while he was building the ark (2 Peter 2:5).
“AND the LORD said unto Noah, ‘Come thou and all thy house into the ark; for thee have I seen righteous before me in this generation’” (Genesis 7:1).
The door was shut.
“And all flesh died that moved upon the earth, both of fowl, and of cattle, and of beast, and of every creeping thing that creepeth upon the earth, and every man” (Genesis 7:21).
In our present time, the same sense of doubt, debate and deliberation is taking place about the coming end of the world on this earth. King Jesus warned: “But as the days of Noe were, so shall also the coming of the Son of man be” (Matthew 24:37).
Jesus also forewarned about being on the wrong side on that day when those will be forever cast into outer darkness (Matthew 8:12), as further emphasized by Jude as the “blackness of darkness” (Jude 1:13).
Jesus says: “There shall be [WEEPING AND GNASHING OF TEETH], when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the Kingdom of God, and you yourselves thrust out” (Luke 13:28).
Believe the gospel because the time is fulfilled (Mark 1:15).