No entry in Lane's Arabic-English Lexicon for the root ف أ ي. Lane (d. 1876) died before completing the lexicon, and its later volumes are thin or absent — this root falls in that gap. Its absence here means only that Lane has no article for it, not that it has no meaning.
The roots that most often share a verse with ف أ ي. Window: the verse. Measure: the number of distinct verses in which both roots occur (of the 9 this root appears in). Ubiquitous roots are excluded so genuinely connected concepts surface — see the method.
Page 1 of 1. The root is highlighted in each verse.
فَلَمَّافَصَلَطَالُوتُبِٱلْجُنُودِقَالَإِنَّٱللَّهَمُبْتَلِيكُمبِنَهَرٍفَمَنشَرِبَمِنْهُفَلَيْسَمِنِّىوَمَنلَّمْيَطْعَمْهُفَإِنَّهُۥمِنِّىٓإِلَّامَنِٱغْتَرَفَغُرْفَةًۢبِيَدِهِۦفَشَرِبُوا۟مِنْهُإِلَّاقَلِيلًامِّنْهُمْفَلَمَّاجَاوَزَهُۥهُوَوَٱلَّذِينَءَامَنُوا۟مَعَهُۥقَالُوا۟لَاطَاقَةَلَنَاٱلْيَوْمَبِجَالُوتَوَجُنُودِهِۦقَالَٱلَّذِينَيَظُنُّونَأَنَّهُممُّلَٰقُوا۟ٱللَّهِكَممِّنفِئَةٍقَلِيلَةٍغَلَبَتْفِئَةًكَثِيرَةًۢبِإِذْنِٱللَّهِوَٱللَّهُمَعَٱلصَّٰبِرِينَ
Reference 2:249قَدْكَانَلَكُمْءَايَةٌفِىفِئَتَيْنِٱلْتَقَتَافِئَةٌتُقَٰتِلُفِىسَبِيلِٱللَّهِوَأُخْرَىٰكَافِرَةٌيَرَوْنَهُممِّثْلَيْهِمْرَأْىَٱلْعَيْنِوَٱللَّهُيُؤَيِّدُبِنَصْرِهِۦمَنيَشَآءُإِنَّفِىذَٰلِكَلَعِبْرَةًلِّأُو۟لِىٱلْأَبْصَٰرِ
Reference 3:13فَمَالَكُمْفِىٱلْمُنَٰفِقِينَفِئَتَيْنِوَٱللَّهُأَرْكَسَهُمبِمَاكَسَبُوٓا۟أَتُرِيدُونَأَنتَهْدُوا۟مَنْأَضَلَّٱللَّهُوَمَنيُضْلِلِٱللَّهُفَلَنتَجِدَلَهُۥسَبِيلًا
Reference 4:88وَمَنيُوَلِّهِمْيَوْمَئِذٍدُبُرَهُۥٓإِلَّامُتَحَرِّفًالِّقِتَالٍأَوْمُتَحَيِّزًاإِلَىٰفِئَةٍفَقَدْبَآءَبِغَضَبٍمِّنَٱللَّهِوَمَأْوَىٰهُجَهَنَّمُوَبِئْسَٱلْمَصِيرُ
Reference 8:16إِنتَسْتَفْتِحُوا۟فَقَدْجَآءَكُمُٱلْفَتْحُوَإِنتَنتَهُوا۟فَهُوَخَيْرٌلَّكُمْوَإِنتَعُودُوا۟نَعُدْوَلَنتُغْنِىَعَنكُمْفِئَتُكُمْشَيْـًٔاوَلَوْكَثُرَتْوَأَنَّٱللَّهَمَعَٱلْمُؤْمِنِينَ
Reference 8:19يَٰٓأَيُّهَاٱلَّذِينَءَامَنُوٓا۟إِذَالَقِيتُمْفِئَةًفَٱثْبُتُوا۟وَٱذْكُرُوا۟ٱللَّهَكَثِيرًالَّعَلَّكُمْتُفْلِحُونَ
Reference 8:45وَإِذْزَيَّنَلَهُمُٱلشَّيْطَٰنُأَعْمَٰلَهُمْوَقَالَلَاغَالِبَلَكُمُٱلْيَوْمَمِنَٱلنَّاسِوَإِنِّىجَارٌلَّكُمْفَلَمَّاتَرَآءَتِٱلْفِئَتَانِنَكَصَعَلَىٰعَقِبَيْهِوَقَالَإِنِّىبَرِىٓءٌمِّنكُمْإِنِّىٓأَرَىٰمَالَاتَرَوْنَإِنِّىٓأَخَافُٱللَّهَوَٱللَّهُشَدِيدُٱلْعِقَابِ
Reference 8:48وَلَمْتَكُنلَّهُۥفِئَةٌيَنصُرُونَهُۥمِندُونِٱللَّهِوَمَاكَانَمُنتَصِرًا
Reference 18:43فَخَسَفْنَابِهِۦوَبِدَارِهِٱلْأَرْضَفَمَاكَانَلَهُۥمِنفِئَةٍيَنصُرُونَهُۥمِندُونِٱللَّهِوَمَاكَانَمِنَٱلْمُنتَصِرِينَ
Reference 28:81No published investigation cites this root yet. When one does, it appears here — the evidence links back to the argument.