The days of Noah are mentioned in the 3 passages below.
Matt 24:32; “Now learn the parable from the fig tree: when its branch has already become tender and puts forth its leaves, you know that summer is near;
Matt 24:33; so, you too, when you see all these things, recognize that He is near, right at the door.
Matt 24:34; Truly I say to you, this generation will not pass away until all these things take place.
Matt 24:35; Heaven and earth will pass away, but My words will not pass away.
Matt 24:36; “But of that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father alone.
Matt 24:37; For the coming of the Son of Man will be just like the days of Noah.
Matt 24:38; For as in those days before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark,
Matt 24:39; and they did not understand until the flood came and took them all away; so will the coming of the Son of Man be.
Matt 24:40; Then there will be two men in the field; one will be taken and one will be left.
Matt 24:41; Two women will be grinding at the mill; one will be taken and one will be left.
Luke 17:22; And He said to the disciples, “The days will come when you will long to see one of the days of the Son of Man, and you will not see it.
Luke 17:23; They will say to you, ‘Look there! Look here!’ Do not go away, and do not run after them.
Luke 17:24; For just like the lightning, when it flashes out of one part of the sky, shines to the other part of the sky, so will the Son of Man be in His day.
Luke 17:25; But first He must suffer many things and be rejected by this generation.
Luke 17:26; And just as it happened in the days of Noah, so it will be also in the days of the Son of Man:
Luke 17:27; they were eating, they were drinking, they were marrying, they were being given in marriage, until the day that Noah entered the ark, and the flood came and destroyed them all.
Luke 17:28; It was the same as happened in the days of Lot: they were eating, they were drinking, they were buying, they were selling, they were planting, they were building;
Luke 17:29; but on the day that Lot went out from Sodom it rained fire and brimstone from heaven and destroyed them all.
Luke 17:30; It will be just the same on the day that the Son of Man is revealed.
Luke 17:31; On that day, the one who is on the housetop and whose goods are in the house must not go down to take them out; and likewise the one who is in the field must not turn back.
Luke 17:32; Remember Lot’s wife.
Luke 17:33; Whoever seeks to keep his life will lose it, and whoever loses his life will preserve it.
Luke 17:34; I tell you, on that night there will be two in one bed; one will be taken and the other will be left.
Luke 17:35; There will be two women grinding at the same place; one will be taken and the other will be left.
Luke 17:36; [Two men will be in the field; one will be taken and the other will be left.”]
Luke 17:37; And answering they *said to Him, “Where, Lord?” And He said to them, “Where the body is, there also the vultures will be gathered.”
1 Pet 3:18 For Christ also died for sins once for all, the just for the unjust, so that He might bring us to God, having been put to death in the flesh, but made alive in the spirit;
1 Pet 3:19; in which also He went and made proclamation to the spirits now in prison,
1 Pet 3:20; who once were disobedient, when the patience of God kept waiting in the days of Noah, during the construction of the ark, in which a few, that is, eight persons, were brought safely through the water.
1 Pet 3:21; Corresponding to that, baptism now saves you—not the removal of dirt from the flesh, but an appeal to God for a good conscience—through the resurrection of Jesus Christ,
1 Pet 3:22; who is at the right hand of God, having gone into heaven, after angels and authorities and powers had been subjected to Him.
To me this is a warning. Life will will be going on usual, people will not be expecting it to happen.
But when it does happen we need to be ready... there are several other verses that mention being watchful, alert, sober, on the lookout, and ready. Some of these verses mention those who want to go back and grab some of their possessions, but I
think the point of those verses is that we have to give up our earthly things and life in order to receive an eternal life.
The other point.. specifically made in Peter .. about a few (specifically 8 people)
Is that "most" people won't be ready. The bridegroom will return like a thief in the night, when people are (spiritually)
asleep. The virgins who ran out of oil weren't ready. We can't turn back to get more oil at that point.
If God was willing to wipeout the entire earth (except for a few souls) back then, do you think He will hesitate
to wipeout the entire earth again? Those who are not believers, obedient, and looking for His return?
What were the days of Noah like?
Genesis 6:5; Then the Lord saw that the wickedness of man was great on the earth, and that every intent of the thoughts of his heart was only evil continually.
Genesis 6:6; The Lord was sorry that He had made man on the earth, and He was grieved in His heart.
Genesis 6:7; The Lord said, “I will blot out man whom I have created from the face of the land, from man to animals to creeping things and to birds of the sky; for I am sorry that I have made them.
This sounds much like the state of mankind today. There are hints here of things to look for. Of how things will be when Christ returns.