Jesus said that His coming would be like the days of Noah.
“But as the days of Noah were, so also will the coming of the Son of Man be.”
Matthew 24:37 NKJV
He continues illustrating the event’s sudden surprise to the world.
38 “For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark, 39 and did not know until the flood came and took them all away, so also will the coming of the Son of Man be. 40 Then two men will be in the field: one will be taken and the other left. 41 Two women will be grinding at the mill: one will be taken and the other left. 42 Watch therefore, for you do not know what hour your Lord is coming.”
Matthew 24:38-42 NKJV
But many believers see Biblical evidence for another aspect of “The Days of Noah,” that being the return of the Genesis 6 giants.
Now it came to pass, when men began to multiply on the face of the earth, and daughters were born to them, 2 that the sons of God saw the daughters of men, that they were beautiful; and they t
ook wives for themselves of all whom they chose.
3 And the Lord said, “My Spirit shall not strive with man forever, for he is indeed flesh; yet his days shall be one hundred and twenty years.” 4 There were giants on the earth in those days, and also afterward, when the sons of God came in to the daughters of men and they bore children to them. Those were the mighty men who were of old, men of renown.
Genesis 6:1-4 NKJV
The Septuagint is a translation what we now call the Old Testament from Hebrew to Greek, done 200 to 300 years before Jesus walked this earth. This is how they translated Isaiah 13:3.
I give command, and I bring them: giants are coming to fulfil my wrath, rejoicing at the same time and insulting.
Isaiah 13:3 Brenton Septuagint Translation
If this notion of returning giants is new to you and you want to know more, I highly recommend this video.
Jesus is coming soon. Be ready!
32 “Now learn this parable from the fig tree: When its branch has already become tender and puts forth leaves, you know that summer is near. 33 So you also, when you see all these things, know that it is near—at the doors! 34 Assuredly, I say to you, this generation will by no means pass away till all these things take place. 35 Heaven and earth will pass away, but My words will by no means pass away.”
Matthew 24:32-35 NKJV
34 “But take heed to yourselves, lest your hearts be weighed down with carousing, drunkenness, and cares of this life, and that Day come on you unexpectedly. 35 For it will come as a snare on all those who dwell on the face of the whole earth. 36 Watch therefore, and pray always that you may be counted worthy to escape all these things that will come to pass, and to stand before the Son of Man.”
Luke 21:34-36 NKJV