Genesis 19:31-36 - WEB
31
The firstborn said to the younger, "Our father is old, and there is not a man in the earth to come in to us after the manner of all the earth.
32
Come, let`s make our father drink wine, and we will lie with him, that we may preserve our father`s seed."
33
They made their father drink wine that night: and the firstborn went in, and lay with her father. He didn`t know when she lay down, nor when she arose.
34
It came to pass on the next day, that the firstborn said to the younger, "Behold, I lay last night with my father. Let us make him drink wine again, tonight. You go in, and lie with him, that we may preserve our father`s seed."
35
They made their father drink wine that night also. The younger arose, and lay with him. He didn`t know when she lay down, nor when she arose.
36
Thus both of Lot`s daughters were with child by their father.
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