And Lot went up out of Zoar, and dwelt in the mountain, and his two daughters with him; for he feared to dwell in Zoar: and he dwelt in a cave, he and his two daughters.
And the first-born said unto the younger, Our father is old, and there is not a man in the earth to come in unto us after the manner of all the earth: come, let us make our father drink wine, and we will lie with him, that we may preserve seed of our father.
And they made their father drink wine that night: and the first-born went in, and lay with her father; and he knew not when she lay down, nor when she arose. And it came to pass on the morrow, that the first-born 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.
And they made their father drink wine that night also: and the younger arose, and lay with him; and he knew not when she lay down, nor when she arose. Thus were both the daughters of Lot with child by their father.
And the first-born bare a son, and called his name Moab: the same is the father of the Moabites unto this day. And the younger, she also bare a son, and called his name Ben-ammi: the same is the father of the children of Ammon unto this day.
Genesis 19 : 30 – 38 (American Standard Version)
“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.”#
# Taken From Matthew Henry’s Concise Commentary