1 verse has
“strengstens”
in Edition A. S. F. Bubenheim and N. Elyas / An-Naml (The Ant)
27:21Ich werde ihn ganz gewiß strengstens strafen, oder ich werde ihn ganz gewiß hinrichten (lassen)', es sei denn, er bringt mir fürwahr eine deutliche Ermächtigung."
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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