2 Peter 2:6-8

... if 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 if he rescued Lot, a righteous man, who was distressed by the depraved conduct of the lawless (for that righteous man, living among them day after day, was tormented in his righteous soul by the lawless deeds he saw and heard)--...

if he condemned the cities of Sodom and Gomorrah by burning them to ashes 
Genesis 19:24-25  Then the LORD rained down burning sulfur on Sodom and Gomorrah--from the LORD out of the heavens. Thus he overthrew those cities and the entire plain, destroying all those living in the cities--and also the vegetation in the land. 

and made them an example 
Numbers 26:10  The earth opened its mouth and swallowed them along with Korah, whose followers died when the fire devoured the 250 men. And they served as an warning sign. [see Numbers 16]
Jude 7  In a similar way, Sodom and Gomorrah and the surrounding towns gave themselves up to sexual immorality and perversion. They serve as an example of those who suffer the punishment of eternal fire.

of what is going to happen to the ungodly 
Matthew 10:15  "Truly I tell you, it will be more bearable for Sodom and Gomorrah on the day of judgment than for that town."
Matthew 11:23-24  "And you, Capernaum, will you be lifted to the heavens? No, you will go down to Hades. For if the miracles that were performed in you had been performed in Sodom, it would have remained to this day. But I tell you that it will be more bearable for Sodom on the day of judgment than for you."
Romans 9:29  It is just as Isaiah said previously: "Unless the Lord Almighty had left us descendants, we would have become like Sodom, we would have been like Gomorrah." [Isaiah 1:9]

and if he rescued Lot, a righteous man 
Genesis 19:16  When he hesitated, the men grasped his hand and the hands of his wife and of his two daughters and led them safely out of the city, for the LORD was merciful to them.

who was distressed by the depraved conduct of the lawless 
2 Peter 3:17-18  Therefore, dear friends, since you have been forewarned, be on your guard so that you may not be carried away by the error of the lawless and fall from your secure position. But grow in the grace and knowledge of our Lord and Savior Jesus Christ. To him be glory both now and forever! Amen.

(for that righteous man ...) 
Hebrews 11:4  By faith Abel brought God a better offering than Cain did. By faith he was commended as righteous, when God spoke well of his offerings. And by faith Abel still speaks, even though he is dead.

[brackets are mine]

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