1 verse has
“أئن”
in Edition Simple Clean / Ash-Shu'araa (The Poets)
41:26فلما جاء السحرة قالوا لفرعون أئن لنا لأجرا إن كنا نحن الغالبين
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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