Genesis 19:35-37

New Revised Standard Version, Anglicised

³⁵ So they made their father drink wine that night also; and the younger rose, and lay with him; and he did not know when she lay down or when she rose. ³⁶ Thus both the daughters of Lot became pregnant by their father. ³⁷ The firstborn bore a son, and named him Moab; he is the ancestor of the Moabites to this day.