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The Doom of Sodom
30Now Lot went up from Zoar with his two daughters and stayed in the mountains, because he was afraid to stay in Zoar; and he stayed in a cave, he and his two daughters. 31Then the firstborn said to the younger, “Our father is old, and there is not a man on earth to have relations with us according to the custom of all the earth. 32Come, let’s make our father drink wine, and let’s sleep with him so that we may keep our family alive through our father.” 33So they made their father drink wine that night, and the firstborn went in and slept with her father; and he did not know when she lay down or got up. 34On the following day, the firstborn said to the younger, “Look, I slept last night with my father; let’s make him drink wine tonight too, then you go in and sleep with him, so that we may keep our family alive through our father.” 35So they had their father drink wine that night too, and the younger got up and slept with him; and he did not know when she lay down or got up. 36And so both of the daughters of Lot conceived by their father. 37The firstborn gave birth to a son, and named him Moab; he is the father of the Moabites to this day. 38As for the younger, she also gave birth to a son, and named him Ben-ammi; he is the father of the sons of Ammon to this day.
Genesis 19:30-38 (NASB)