Genesis 19:34 WBT

³²  Come, let us make our father drink wine, and we will lie with him, that we may preserve seed of our father.

³³  And they made their father drink wine that night: and the first-born went in and lay with her father; and he perceived not when she lay down, nor when she arose.

³⁴  And it came to pass on the morrow that the first born said to the younger, Behold, I lay yesternight with my father; let us make him drink wine this night also; and go thou in, [and] lie with him, that we may preserve seed of our father.

³⁵  And they made their father drink wine that night also: and the younger arose and lay with him; and he perceived not when she lay down, nor when she arose.

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