1 verse has
“abmüht”
in Edition A. S. F. Bubenheim and N. Elyas / Al-Ankaboot (The Spider)
29:6Und wer sich abmüht, der müht sich nur zu seinem eigenen Vorteil ab, denn Allah ist der Weltenbewohner fürwahr unbedürftig.
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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