ٱرْهَبُونِ
Appears 2 times in the Quran.
(Root: رهب)
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2:40 يَٰبَنِىٓ إِسْرَٰٓءِيلَ ٱذْكُرُوا۟ نِعْمَتِىَ ٱلَّتِىٓ أَنْعَمْتُ عَلَيْكُمْ وَأَوْفُوا۟ بِعَهْدِىٓ أُوفِ بِعَهْدِكُمْ وَإِيَّٰىَ فَٱرْهَبُونِ
O children of Israel! call to mind My favor which I bestowed on you and be faithful to (your) covenant with Me, I will fulfill (My) covenant with you; and of Me, Me alone, should you be afraid.
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16:51 وَقَالَ ٱللَّهُ لَا تَتَّخِذُوٓا۟ إِلَٰهَيْنِ ٱثْنَيْنِ إِنَّمَا هُوَ إِلَٰهٌ وَٰحِدٌ فَإِيَّٰىَ فَٱرْهَبُونِ
And Allah has said: Take not two gods, He is only one Allah; so of Me alone should you be afraid.