Genesis 19:33
King James Version
“And they made their father drink wine that night: and the firstborn went in, and lay with her father; and he perceived not when she lay down, nor when she arose.”
Context
30And Lot went up out of Zoar, and dwelt in the mountain, and his two daughters with him; for he feared to dwell in Zoar: and he dwelt in a cave, he and his two daughters.
31And the firstborn said unto the younger, Our father old, and not a man in the earth to come in unto us after the manner of all the earth:
32Come, let us make our father drink wine, and we will lie with him, that we may preserve seed of our father.
33And they made their father drink wine that night: and the firstborn went in, and lay with her father; and he perceived not when she lay down, nor when she arose.
34And it came to pass on the morrow, that the firstborn said unto the younger, Behold, I lay yesternight with my father: let us make him drink wine this night also; and go thou in, lie with him, that we may preserve seed of our father.
35And 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.
36Thus were both the daughters of Lot with child by their father.