Numbers 26:10
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.
Torrey's Topical Textbook—AKJV

1 Corinthians 10:6-11
Now these things were our examples, to the intent we should not lust after evil things, as they also lusted.
Torrey's Topical Textbook—AKJV

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, are set forth for an example, suffering the vengeance of eternal fire.
Torrey's Topical Textbook—AKJV