Genesis 6:8

4 The Nephilim were on the earth in those days—and afterward as well—when the sons of God had relations with the daughters of men. And they bore them children who became the mighty men of old, men of renown.

5 Then the LORD saw that the wickedness of man was great upon the earth, and that every inclination of the thoughts of his heart was altogether evil all the time.

6 And the LORD regretted that He had made man on the earth, and He was grieved in His heart.

7 So the LORD said, “I will blot out man, whom I have created, from the face of the earth—every man and beast and crawling creature and bird of the air—for I am grieved that I have made them.”

8 Noah, however, found favor in the eyes of the LORD.

9 This is the account of Noah. Noah was a righteous man, blameless in his generation; Noah walked with God.

10 And Noah had three sons: Shem, Ham, and Japheth.

11 Now the earth was corrupt in the sight of God, and full of violence.

12 And God looked upon the earth and saw that it was corrupt; for all living creatures on the earth had corrupted their ways.

Read all of Genesis 6