1 verse has
“مُطْمَئِنِّينَ”
in Edition Uthmani / Al-Israa (The Night Journey)
95:17قُل لَّوْ كَانَ فِى ٱلْأَرْضِ مَلَٰٓئِكَةٌۭ يَمْشُونَ مُطْمَئِنِّينَ لَنَزَّلْنَا عَلَيْهِم مِّنَ ٱلسَّمَآءِ مَلَكًۭا رَّسُولًۭا
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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