1 verse has
“undankbar”
in Edition A. S. F. Bubenheim and N. Elyas / Al-Baqara (The Cow)
2:152Gedenkt Meiner, so gedenke Ich eurer. Seid Mir dankbar und seid nicht undankbar gegen Mich.
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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