The Quran root س ف ل s-f-l

إِنَّ الْمُنَافِقِينَ فِي الدَّرْكِ الْأَسْفَلِ مِنَ النَّارِ وَلَن تَجِدَ لَهُمْ نَصِيرًا ١٤٥

الْأَسْفَلِ l-asfali · the lowest

Indeed, the hypocrites will be in the lowest depths of the Fire - and never will you find for them a helper - (Surah An-Nisa, 4:145)

إِذْ أَنتُم بِالْعُدْوَةِ الدُّنْيَا وَهُم بِالْعُدْوَةِ الْقُصْوَىٰ وَالرَّكْبُ أَسْفَلَ مِنكُمْ وَلَوْ تَوَاعَدتُّمْ لَاخْتَلَفْتُمْ فِي الْمِيعَادِ وَلَٰكِن لِّيَقْضِيَ اللَّهُ أَمْرًا كَانَ مَفْعُولًا لِّيَهْلِكَ مَنْ هَلَكَ عَن بَيِّنَةٍ وَيَحْيَىٰ مَنْ حَيَّ عَن بَيِّنَةٍ وَإِنَّ اللَّهَ لَسَمِيعٌ عَلِيمٌ ٤٢

أَسْفَلَ asfala · (was) lower

[Remember] when you were on the near side of the valley, and they were on the farther side, and the caravan was lower [in position] than you. If you had made an appointment [to meet], you would have missed the appointment. But [it was] so that Allāh might accomplish a matter already destined - that those who perished [through disbelief] would perish upon evidence and those who lived [in faith] would live upon evidence; and indeed, Allāh is Hearing and Knowing. (Surah Al-Anfal, 8:42)

فَلَمَّا جَاءَ أَمْرُنَا جَعَلْنَا عَالِيَهَا سَافِلَهَا وَأَمْطَرْنَا عَلَيْهَا حِجَارَةً مِّن سِجِّيلٍ مَّنضُودٍ ٨٢

سَافِلَهَا sāfilahā · its downside

So when Our command came, We made the highest part [of the city] its lowest and rained upon them stones of layered hard clay, [which were] (Surah Hud, 11:82)

إِلَّا تَنصُرُوهُ فَقَدْ نَصَرَهُ اللَّهُ إِذْ أَخْرَجَهُ الَّذِينَ كَفَرُوا ثَانِيَ اثْنَيْنِ إِذْ هُمَا فِي الْغَارِ إِذْ يَقُولُ لِصَاحِبِهِ لَا تَحْزَنْ إِنَّ اللَّهَ مَعَنَا فَأَنزَلَ اللَّهُ سَكِينَتَهُ عَلَيْهِ وَأَيَّدَهُ بِجُنُودٍ لَّمْ تَرَوْهَا وَجَعَلَ كَلِمَةَ الَّذِينَ كَفَرُوا السُّفْلَىٰ وَكَلِمَةُ اللَّهِ هِيَ الْعُلْيَا وَاللَّهُ عَزِيزٌ حَكِيمٌ ٤٠

السُّفْلَىٰ l-suf'lā · the lowest

If you do not aid him [i.e., the Prophet (ﷺ)] - Allāh has already aided him when those who disbelieved had driven him out [of Makkah] as one of two, when they were in the cave and he [i.e., Muḥammad (ﷺ)] said to his companion, "Do not grieve; indeed Allāh is with us." And Allāh sent down His tranquility upon him and supported him with soldiers [i.e., angels] you did not see and made the word of those who disbelieved the lowest, while the word of Allāh - that is the highest. And Allāh is Exalted in Might and Wise. (Surah At-Tawbah, 9:40)