Genesis 19:34 DBY

³²  come, let us give our father wine to drink, and let us lie with him, that we may preserve seed alive of our father.

³³  And they gave their father wine to drink that night. And the first-born went in, and lay with her father, and he did not know of her lying down, nor of her rising.

³⁴  And it came to pass on the next day that the first-born said to the younger, Lo, I lay last night with my father: let us give him wine to drink to-night also, and go thou in, lie with him, that we may preserve seed alive of our father.

³⁵  And they gave their father wine to drink that night also. And the younger arose, and lay with him; and he did not know of her lying down, nor of her rising.

³⁶  And both the daughters of Lot were with child by their father.