2 verses have
“قَلْبٌ”
in Edition Uthmani / Qaaf (The letter Qaaf)
33:50مَّنْ خَشِىَ ٱلرَّحْمَٰنَ بِٱلْغَيْبِ وَجَآءَ بِقَلْبٍۢ مُّنِيبٍ
37:50إِنَّ فِى ذَٰلِكَ لَذِكْرَىٰ لِمَن كَانَ لَهُۥ قَلْبٌ أَوْ أَلْقَى ٱلسَّمْعَ وَهُوَ شَهِيدٌۭ
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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