Genesis 6:4-6

Young's Literal Translation

⁴ 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.

⁵ 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;

⁶ and Jehovah repenteth that He hath made man in the earth, and He grieveth Himself -- unto His heart.