3 verses have
“warner”
in Edition Clear Qur'an by Talal Itani / Al-Furqaan (The Criterion)
25:7And they say, “What sort of messenger is this, who eats food, and walks in the marketplaces? If only an angel was sent down with him, to be alongside him a warner.”
25:51Had We willed, We could have sent to every town a warner.
25:56We sent you only as a herald of good news and a warner.
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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