1 verse has
“abmühen”
in Edition A. S. F. Bubenheim and N. Elyas / Al-Ankaboot (The Spider)
29:69Diejenigen aber, die sich um Unsertwillen abmühen, werden Wir ganz gewiß Unsere Wege leiten. Und Allah ist wahrlich mit den Gutes Tuenden.
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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