تَطْمَئِنَّ
Appears 3 times in the Quran.
(Root: طمن)
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3:126 وَمَا جَعَلَهُ ٱللَّهُ إِلَّا بُشْرَىٰ لَكُمْ وَلِتَطْمَئِنَّ قُلُوبُكُم بِهِۦ وَمَا ٱلنَّصْرُ إِلَّا مِنْ عِندِ ٱللَّهِ ٱلْعَزِيزِ ٱلْحَكِيمِ
And Allah did not make it but as good news for you, and that your hearts might be at ease thereby, and victory is only from Allah, the Mighty, the Wise.
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5:113 قَالُوا۟ نُرِيدُ أَن نَّأْكُلَ مِنْهَا وَتَطْمَئِنَّ قُلُوبُنَا وَنَعْلَمَ أَن قَدْ صَدَقْتَنَا وَنَكُونَ عَلَيْهَا مِنَ ٱلشَّٰهِدِينَ
They said: We desire that we should eat of it and that our hearts should be at rest, and that we may know that you have indeed spoken the truth to us and that we may be of the witnesses to it.
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8:10 وَمَا جَعَلَهُ ٱللَّهُ إِلَّا بُشْرَىٰ وَلِتَطْمَئِنَّ بِهِۦ قُلُوبُكُمْ وَمَا ٱلنَّصْرُ إِلَّا مِنْ عِندِ ٱللَّهِ إِنَّ ٱللَّهَ عَزِيزٌ حَكِيمٌ
And Allah only gave it as a good news and that your hearts might be at ease thereby; and victory is only from Allah; surely Allah is Mighty, Wise.