3 verses have
“warn”
in Edition Clear Qur'an by Talal Itani / Al-Kahf (The Cave)
18:2Valuable—to warn of severe punishment from Himself; and to deliver good news to the believers who do righteous deeds, that they will have an excellent reward.
18:4And to warn those who say, “God has begotten a son.”
18:56We send the messengers only as deliverers of good news and warners. Those who disbelieve argue with false argument, in order to defeat the truth thereby. They take My Verses, and the warnings, for a joke.
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Those who spend their wealth by night and day, privately and publicly, will receive their reward from their Lord. They have nothing to fear, nor shall they grieve.
The Holy Quran · Al-Baqara (The Cow) · 2:274