2 verses have
“كَلَّا”
in Edition Uthmani / An-Naba (The Announcement)
4:78كَلَّا سَيَعْلَمُونَ
5:78ثُمَّ كَلَّا سَيَعْلَمُونَ
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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