2 Peter 2:6

and if he condemned by destruction the cities of Sodom and Gomorrha, turning them into ashes, making them an example unto those that after should live without fear and reverence of God;

Jude 1:7

Even as Sodom and Gomorrha and the cities about them in like manner, giving themselves over to fornication and going after strange flesh, were set forth for an example, having received the judgment of eternal fire.

Numbers 26:10

And the earth opened her mouth and swallowed them up together with Korah, when that company died, when the fire devoured two hundred and fifty men and they became an example.

Deuteronomy 29:23

and that the whole land thereof is brimstone and salt and burning, that it is not sown, nor shall it produce anything, nor shall any grass grow therein, like in the overthrow of Sodom and Gomorrah, Admah, and Zeboim, which the LORD overthrew in his anger and in his wrath;

Genesis 19:24-25

Then the LORD rained upon Sodom and upon Gomorrah brimstone and fire from the LORD out of the heavens;

Luke 17:28-30

Likewise also as it was in the days of Lot; they ate, they drank, they bought, they sold, they planted, they built;

Genesis 19:28

And he looked toward Sodom and Gomorrah and toward all the land of that plain and beheld that the smoke of the land went up as the smoke of a furnace.

Isaiah 13:19

And Babylon, the glory of kingdoms, the beauty of the Chaldees' excellency, shall be as when God overthrew Sodom and Gomorrah.

Jeremiah 50:40

As God overthrew Sodom and Gomorrah and the neighbour cities thereof, saith the LORD; so shall no man abide there, neither shall any son of man dwell therein.

Ezekiel 16:49-56

Behold, this was the iniquity of thy sister Sodom: pride, fullness of bread, and abundance of idleness was in her and in her daughters, neither did she strengthen the hand of the afflicted and needy.

Hosea 11:8

How must I leave thee, Ephraim? how shall I give thee up, Israel? how could I make thee as Admah? nor set thee as Zeboim? my heart churns within me; all my compassion is inflamed.

Amos 4:11

I have overthrown some of you as God overthrew Sodom and Gomorrah, and ye were as a firebrand plucked out of the fire; and ye never returned unto me, said the LORD.

Zephaniah 2:9

Therefore as I live, said the LORD of the hosts, the God of Israel, Surely Moab shall be as Sodom and the sons of Ammon as Gomorrah, even a field of nettles and saltpits and a perpetual desolation; the remnant of my people shall spoil them, and the remnant of my Gentiles shall inherit them.

1 Corinthians 10:11

Now all these things happened unto them as types, and they are written for our admonition, upon whom the ends of the ages are come.

Jude 1:15

to execute judgment upon all and to convince all that are ungodly among them of all their ungodly deeds which they have unfaithfully committed and of all the hard words which the unfaithful sinners have spoken against him.

Treasury of Scripture Knowledge

Summary

And turning the cities of Sodom and Gomorrha into ashes condemned them with an overthrow, making them an ensample unto those that after should live ungodly;

Bible References

Turning

Genesis 19:24
Then the LORD rained upon Sodom and upon Gomorrah brimstone and fire from the LORD out of the heavens;
Deuteronomy 29:23
and that the whole land thereof is brimstone and salt and burning, that it is not sown, nor shall it produce anything, nor shall any grass grow therein, like in the overthrow of Sodom and Gomorrah, Admah, and Zeboim, which the LORD overthrew in his anger and in his wrath;
Isaiah 13:19
And Babylon, the glory of kingdoms, the beauty of the Chaldees' excellency, shall be as when God overthrew Sodom and Gomorrah.
Jeremiah 50:40
As God overthrew Sodom and Gomorrah and the neighbour cities thereof, saith the LORD; so shall no man abide there, neither shall any son of man dwell therein.
Ezekiel 16:49
Behold, this was the iniquity of thy sister Sodom: pride, fullness of bread, and abundance of idleness was in her and in her daughters, neither did she strengthen the hand of the afflicted and needy.
Hosea 11:8
How must I leave thee, Ephraim? how shall I give thee up, Israel? how could I make thee as Admah? nor set thee as Zeboim? my heart churns within me; all my compassion is inflamed.
Amos 4:11
I have overthrown some of you as God overthrew Sodom and Gomorrah, and ye were as a firebrand plucked out of the fire; and ye never returned unto me, said the LORD.
Zephaniah 2:9
Therefore as I live, said the LORD of the hosts, the God of Israel, Surely Moab shall be as Sodom and the sons of Ammon as Gomorrah, even a field of nettles and saltpits and a perpetual desolation; the remnant of my people shall spoil them, and the remnant of my Gentiles shall inherit them.
Luke 17:28
Likewise also as it was in the days of Lot; they ate, they drank, they bought, they sold, they planted, they built;
Jude 1:7
Even as Sodom and Gomorrha and the cities about them in like manner, giving themselves over to fornication and going after strange flesh, were set forth for an example, having received the judgment of eternal fire.

Making

Numbers 26:10
And the earth opened her mouth and swallowed them up together with Korah, when that company died, when the fire devoured two hundred and fifty men and they became an example.
Deuteronomy 29:23
and that the whole land thereof is brimstone and salt and burning, that it is not sown, nor shall it produce anything, nor shall any grass grow therein, like in the overthrow of Sodom and Gomorrah, Admah, and Zeboim, which the LORD overthrew in his anger and in his wrath;
1 Corinthians 10:11
Now all these things happened unto them as types, and they are written for our admonition, upon whom the ends of the ages are come.

General references

Joshua 22:20
Peradventure did Achan, the son of Zerah, not commit a trespass in the anathema, and wrath fell on all the congregation of Israel? And that man did not perish alone in his iniquity.
Jeremiah 50:40
As God overthrew Sodom and Gomorrah and the neighbour cities thereof, saith the LORD; so shall no man abide there, neither shall any son of man dwell therein.
Luke 17:29
but the same day that Lot went out of Sodom it rained fire and brimstone from heaven and destroyed them all.
Luke 19:40
And he answered and said unto them, I tell you that if these should be silent, the stones would immediately cry out.