30 Afterward Lot left Zoar because he was afraid of the people there, and he went to live in a cave in the mountains with his two daughters. 31 One day the older daughter said to her sister, "There are no men left anywhere in this entire area, so we can't get married like everyone else. And our father will soon be too old to have children. 32 Come, let's get him drunk with wine, and then we will have sex with him. That way we will preserve our family line through our father." 33 So that night they got him drunk with wine, and the older daughter went in and had intercourse with her father. He was unaware of her lying down or getting up again. 34 The next morning the older daughter said to her younger sister, "I had sex with our father last night. Let's get him drunk with wine again tonight, and you go in and have sex with him. That way we will preserve our family line through our father." 35 So that night they got him drunk with wine again, and the younger daughter went in and had intercourse with him. As before, he was unaware of her lying down or getting up again. 36 As a result, both of Lot's daughters became pregnant by their own father. 37 When the older daughter gave birth to a son, she named him Moab. He became the ancestor of the nation now known as the Moabites. 38 When the younger daughter gave birth to a son, she named him Ben-ammi. He became the ancestor of the nation now known as the Ammonites.
Matthew Henry's Commentary on Genesis 19:30-38
Commentary on Genesis 19:30-38
(Read Genesis 19:30-38)
See the peril of security. Lot, who kept chaste in Sodom, and was a mourner for the wickedness of the place, and a witness against it, when in the mountain, alone, and, as he thought, out of the way of temptation, is shamefully overtaken. Let him that thinks he stands high, and stands firm, take heed lest he fall. See the peril of drunkenness; it is not only a great sin itself, but lets in many sins, which bring a lasting wound and dishonour. Many a man does that, when he is drunk, which, when he is sober, he could not think of without horror. See also the peril of temptation, even from relations and friends, whom we love and esteem, and expect kindness from. We must dread a snare, wherever we are, and be always upon our guard. No excuse can be made for the daughters, nor for Lot. Scarcely any account can be given of the affair but this, The heart is deceitful above all things, and desperately wicked: who can know it? From the silence of the Scripture concerning Lot henceforward, learn that drunkenness, as it makes men forgetful, so it makes them to be forgotten.