1 verse has
“abmühen”
in Edition A. S. F. Bubenheim and N. Elyas / Muhammad (Muhammad)
47:31Und Wir werden euch ganz gewiß prüfen, bis Wir feststellen, welche sich abmühen von euch und welche standhaft sind, und bis Wir eure Werke prüfen.
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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