1 verse has
“insgeheim”
in Edition A. S. F. Bubenheim and N. Elyas / Taa-Haa (Taa-Haa)
20:62Da stritten sie untereinander über ihre Angelegenheit und führten insgeheim vertrauliche Gespräche.
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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