[9] The thing that hath been, it is that which shall be; and that which is done is that which shall be done: and there is no new thing under the sun. [10] Is there any thing whereof it may be said, See, this is new? It hath been already of old time, which was before us. — Ecclesiastes:1
“That which hath been is now; and that which is to be hath already been; and God requireth that which is past.” — Ecclesiastes 3:15.
"Flammarian Engraving" - Artist Unknown, Public Domain Image
When passages repeat it is because the concept is important and God wants us to understand and remember it. Repetition is how we learn. So when something repeats three times within three chapters of the same book we should take heed to what the Lord is trying to teach us. There are common threads woven throughout the Bible and one of them is that human nature does not change. As depraved and wicked as people were in Genesis 6, so will they be in the latter days.
[37] But as the days of Noe were, so shall also the coming of the Son of man be.[38] For as in the days that were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noe entered into the ark, [39] And knew not until the flood came, and took them all away; so shall the coming of the Son of man be. — Matthew 24
No new thing under the sun. Peter, no doubt remembering the words of Jesus, makes a similar point:
[3] Knowing this first, that there shall come in the last days scoffers, walking after their own lusts, [4] And saying, Where is the promise of his coming? For since the fathers fell asleep, all things continue as they were from the beginning of the creation. [5] For this they willingly are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water:
Garden of Earthly Delights - Hieronymus Bosch
[6] Whereby the world that then was being overflowed with water, perished:
[7] But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men. — 2nd Peter:3
Garden of Earthly Delights - Hell, Hieronymus Bosch
"Jesus Christ the same yesterday, and to day, and for ever." -Hebrews 13:
Preach!