2 verses have
“whether”
in Edition Clear Qur'an by Talal Itani / Al-Anbiyaa (The Prophets)
21:109But if they turn away, say, “I have informed you sufficiently. Although I do not know whether what you are promised is near or far.”
21:111“And I do not know whether it is perhaps a trial for you, and an enjoyment for a while.”
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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