2 Peter 2:6

and if he condemned the cities of Sodom and Gomorrah to destruction by reducing them to ashes, having made them an example to those who would live ungodly thereafter;

1 Corinthians 10:6-10

Now these things are examples for us, not to desire evil things as they did.

Jude 1:7

just as Sodom and Gomorrah and the surrounding cities, which likewise acted immorally and indulged in strange flesh, serve as an example by undergoing a punishment of eternal fire.

Treasury of Scripture Knowledge

Summary

And the earth opened her mouth, and swallowed them up together with Korah, when that company died, what time the fire devoured two hundred and fifty men: and they became a sign.

Bible References

They became a sign

1 Corinthians 10:6
Now these things are examples for us, not to desire evil things as they did.
2 Peter 2:6
and if he condemned the cities of Sodom and Gomorrah to destruction by reducing them to ashes, having made them an example to those who would live ungodly thereafter;
Jude 1:7
just as Sodom and Gomorrah and the surrounding cities, which likewise acted immorally and indulged in strange flesh, serve as an example by undergoing a punishment of eternal fire.