1 verse has
“Rufer”
in Edition A. S. F. Bubenheim and N. Elyas / Qaaf (The letter Qaaf)
50:41Und höre zu am Tag, da der Rufer von einem nahen Ort aus ruft,
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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