Genesis 6:2-5

YLT(i) 2 and sons of God see the daughters of men that they are fair, and they take to themselves women of all whom they have chosen.
3 And Jehovah saith, `My Spirit doth not strive in man—to the age; in their erring they are flesh:' and his days have been an hundred and twenty years.
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;