4 verses have
“warner”
in Edition Clear Qur'an by Talal Itani / Saba (Sheba)
34:28We sent you only universally to all people, a herald and warner, but most people do not know.
34:34We sent no warner to any town, without its affluent saying, “We reject what you are sent with.”
34:44But We gave them no book to study, and We did not send them any warner before you.
34:46Say, “I offer you a single advice: devote yourselves to God, in pairs, or individually; and reflect. There is no madness in your friend. He is just a warner to you, before the advent of a severe punishment.”
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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