Gen 19: Sodom destroyed, Lot and his daughters rescued by the angels; Lot's daughters having children for him in desperation

2Pet 2:6-8: "he condemned the cities of Sodom and Gomorrah by burning them to ashes, and made them an example of what is going to happen to the ungodly; and...rescued Lot, a righteous man, who was distressed by the filthy lives of lawless men"

• v1: The two angles sought out Lot, the only good man in Sodom. He sufficiently distinguished himself from the rest of the neighbours, and greeted and bowed down to them with utmost respect.
• v2-3: Like Abraham, Lot was hospitable, and even when the angles declined his invitation, pressed upon them greatly that they went with him. In Abraham's and Lot's time, motels and inns in towns were not common place, and travellers would usually wait in the square in the evening, where it was custom and expected that at one of the townsfolk should take them in.
• v4-5: "all the men" in the city surrounded Lot's house. Here it is made plain that they were all wicked, old and young. It was a most unnatural and abominable wickedness that they set themselves upon, one that still bears their name i.e. sodomy. And hence "Because of this, God gave them over to shameful lusts. Even their women exchanged natural relations for unnatural ones. In the same way the men also abandoned natural relations with women and were inflamed with lust for one another. Men committed indecent acts with other men, and received in themselves the due penalty for their perversion." (Rom 1:26-27)
• v6-8: Lot went out and spoke to them civilly, calling them friends, and appealing with them. He unadvisedly and unjustifiably offered to prostitute his two daughters with them. This might be less astonishing in the context of the time, when women (wives and daughters) were regarded as objects and possessions. Also, a man's hospitality was regarded as the ultimate test for a man's character. Taking a stranger into your house to have a meal implied that the stranger had come under one's household's protection, even at personal risk to the host. Hence Lot, perhaps corrupted in his thinking by being among the Sodomites for so long, felt bound by the laws of hospitability and the protection of his house which his guests were entitled to, that he overlooked his own daughters' safety.
• v9: The men of Sodom ridiculed and threatened Lot, and hence led to their own destruction by refusing to listen to godly counsel "A man who remains stiff-necked after many rebukes will suddenly be destroyed—without remedy" (Prov 29:1)
• v10-11: Nothing less than the power of an angel could save Lot out of the wicked hands of Sodom. The Sodomites were blinded, to put an end to their attempt, and to disable them from pursuing it.
• v12-13: Angels are ministers of God's wrath for the destruction of sinners, as well as of His mercy for the deliverance of the godly. Lot was given notice of Sodom's ruin, not only to prepare himself, but so that he could give notice to his friends and relations, that they might be saved along with him. Likewise, when we first receive the good news of salvation, we are to do all we can for the salvation of those around us. Notice also, that the angels did not ask if he knew any righteous ones in the city fir to be spared (there were none!), but they asked what relations he had, that whether righteous or unrighteous, they might be saved with him.
• v14: Lot went out to speak to his sons-in-law, implying that they, as part of the entire town of men, were right outside his door. Yet his sons-in-law thought perhaps that Lot, terrified by the rest of the Sodomites, was babbling. It is either that Lot's sons-in-law were not blinded (for if they were they should be afraid that God might ahve further punishment), or if they were not blinded, did not know God and hence did not believe in His wrath and judgement.
• v15:Though there were not ten righteous men in sodom, there was one righteous man who was delivered.
• v16: God's mercy, that when Lot hesitated, the angels took his hands and led him away. Many under conviction about their fallen spiritual state, seeing the necessity of change, fail to make haste and take action, foolishly lingering in sin for just that little longer.
• v17: Lot was told to flee, to not look behind, and to place as much distance between himself and Sodom as he could. These too are the commands given to those who through grace are saved from sin: to not return to sin, to not rest in the world (staying in the plain), and to reach towards Christ and heaven (escaping to the mountain)
• v18-22: God had a place of refuge for Lot, but Lot begged for a city of refuge, one of his own choosing. He petitioned upon the smallness of the place, hoping that it would not be as bad as the rest. In contrast with Abraham's intercession for Sodom, Lot's intercession was from self-interest, to show how the fervent prayer of a righteous man prevails. Sodom's ruin as suspended until he was safe, for God takes care to ensure the preservation of His people - "Do not harm the land or the sea or the trees until we put a seal on the foreheads of the servants of our God" (Rev 7:3)
• v24: On the wicked he will rain
  fiery coals and burning sulfur;
  a scorching wind will be their lot (Ps 11:6)
• v25: An utter and irreparable ruin, as a punishment to sin, it was designed to reveal the wrath of God against sin in all ages. It is typical of the vengeance of eternal fire, and hell is often represented by a burning lake of fire and brimstone.
• v26: "It will be just like this on the day the Son of Man is revealed. On that day no one who is on the roof of his house, with his goods inside, should go down to get them. Likewise, no one in the field should go back for anything. Remember Lot's wife!" (Lu 17:30-32). Lot's wife looked back, and hence disobeyed an express command (similar to Adam's transgression). It stemmed out of a longing for her house and goods in Sodom, showing an inclination to go back (i.e. to head back to apostasy after having just before renounced the world). Hence Paul reminds us: "But one thing I do: Forgetting what is behind and straining toward what is ahead, I press on toward the goal to win the prize for which God has called me heavenward in Christ Jesus" (Phil 3:13-14)
• v27-29: Abraham returned to the place where he stood before God
• v30-38: Lot was frightened out of Zoah, probably because it was a refuge of his own choosing and hence could not trust his safety in it. He decided to go to the mountain, rather than return to Abraham and put himself under his protection. (pride?) He went to the mountain, where God had originally appointed for his shelter, and was reduced to living in a cave in solitude with his two daughters.