1 verse has
“undankbar”
in Edition A. S. F. Bubenheim and N. Elyas / Ar-Room (The Romans)
30:34um undankbar zu sein für das, was Wir ihnen gegeben haben. - Genießt nur; ihr werdet (es noch) erfahren.
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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