Genesis 19:34-38
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34 And 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, and lie with him, that we may preserve seed of our father.
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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.
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36 Thus were both the daughters of Lot with child by their father.
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37 And the first born bare a son, and called his name Moab: the same is the father of the Moabites unto this day.
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38 And the younger, she also bare a son, and called his name Benammi: the same is the father of the children of Ammon unto this day.