Numbers 26:10 and the earth opened its mouth and swallowed them up along with Korah, when that company died, when the fire devoured 250 men, so that they became a warning.

Isaiah 8:18 Behold, I and the children whom the LORD has given me are for signs and wonders in Israel from the LORD of hosts, who dwells on Mount Zion.

Ezekiel 5:15 'So it will be a reproach, a reviling, a warning and an object of horror to the nations who surround you when I execute judgments against you in anger, wrath and raging rebukes. I, the LORD, have spoken.

Ezekiel 14:8 "I will set My face against that man and make him a sign and a proverb, and I will cut him off from among My people. So you will know that I am the LORD. (NASB ©1995)