1 verse has
“كَادِحٌ”
in Edition Uthmani / Al-Inshiqaaq (The Splitting Open)
6:84يَٰٓأَيُّهَا ٱلْإِنسَٰنُ إِنَّكَ كَادِحٌ إِلَىٰ رَبِّكَ كَدْحًۭا فَمُلَٰقِيهِ
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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