Genesis 6:2 WBT

¹  And it came to pass, when men began to multiply on the face of the earth, and daughters were born to them,

²  That the sons of God saw the daughters of men that they [were] fair; and they took them wives of all whom they chose.

³  And the LORD said, My spirit shall not always strive with man, for that he also [is] flesh: yet his days shall be a hundred and twenty years.

⁴  There were giants in the earth in those days; and also after that, when the sons of God came in to the daughters of men, and they bore [children] to them: the same [became] mighty men, who [were] of old, men of renown.