2 verses have
“رَبُّنَآ”
in Edition Uthmani / Al-Qalam (The Pen)
29:68قَالُوا۟ سُبْحَٰنَ رَبِّنَآ إِنَّا كُنَّا ظَٰلِمِينَ
32:68عَسَىٰ رَبُّنَآ أَن يُبْدِلَنَا خَيْرًۭا مِّنْهَآ إِنَّآ إِلَىٰ رَبِّنَا رَٰغِبُونَ
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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