Genesis 6:4-6

The fallen ones were in the earth in those days, and even afterwards when sons of God come in unto daughters of men, and they have borne to them — they [are] the heroes, who, from of old, [are] the men of name. And JEHOVAH seeth that abundant [is] the wickedness of man in the earth, and every imagination of the thoughts of his heart only evil all the day; and JEHOVAH repenteth that He hath made man in the earth, and He grieveth Himself — unto His heart.