2 verses have
“مكنون”
in Edition Simple Clean / Al-Waaqia (The Inevitable)
23:56كأمثال اللؤلؤ المكنون
78:56في كتاب مكنون
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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