1 verse has
“undankbar”
in Edition A. S. F. Bubenheim and N. Elyas / Al-Ankaboot (The Spider)
29:66um undankbar zu sein für das, was Wir ihnen gegeben haben, und um zu genießen; sie werden (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