"And it came to pass, when men began to multiply on the face of the earth... That the sons of God
saw the daughters of men that they were fair; and they took them wives of all which they chose.
There were giants in the earth in those days; and also after that, when the sons of God
came in unto the daughters of men, and they bare children to them, the same became mighty men
which were of old, men of renown." (Genesis 6:1-2,4.)