2 verses have
“كَلَّآ”
in Edition Uthmani / Al-Ma'aarij (The Ascending Stairways)
15:70كَلَّآ ۖ إِنَّهَا لَظَىٰ
39:70كَلَّآ ۖ إِنَّا خَلَقْنَٰهُم مِّمَّا يَعْلَمُونَ
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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