Genesis 19:35
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. 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.
The act took place in a cave in the mountains where Lot was living after leaving Zoar, stripped of everything for which he had exposed his family to the influences of a wicked city. There the younger daughter, together with her elder sister, made their father drink wine that night also and then lay with him, while he perceived not when she lay down nor when she arose. Their sinful conduct after leaving Sodom was the result of their wicked associations and corrupting life there, which had confused their sense of right and wrong so that sin no longer appeared sinful but seemed acceptable. Its moral corruption had become so interwoven with their character that they could not distinguish between good and evil.
That the deed was done without her father's knowledge shows that the curse of Sodom followed Lot even to that mountain refuge. The fruit of this act was Lot's only posterity, the Moabites and the Ammonites, vile idolatrous tribes who were rebels against God and bitter enemies of His people. The episode stands as part of the faithful record of Lot's sin, failure, and human frailty, showing that even a believer can be overcome by temptation. It was preserved as a warning and lesson for later generations.
As part of the account of the depravity associated with Sodom, it warns against exposing young people to corrupting places and associations. It belongs to the account of Sodom that is connected with the abominations later found among the Canaanites, with Sodom's destruction standing as a warning against those evils. The wickedness of Sodom described in this context is now being repeated as the world grows worse and worse and the cities become as Sodom and Gomorrah. This is a sign of the times to be discerned, meaning believers should not without God's counsel move to make large plants and establish business interests in cities such as Melbourne.