2 verses have
“naku”
in Edition English Transliteration / Al-Muddaththir (The Cloaked One)
74:43Qaaloo lam naku minal musalleen
74:44Wa lam naku nut'imul miskeen
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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