1 verse has
“fürwahr”
in Edition A. S. F. Bubenheim and N. Elyas / Al-Ma'aarij (The Ascending Stairways)
70:40Nein! Ich schwöre beim Herrn der Osten und der Westen, Wir haben fürwahr die Macht dazu,
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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