أَسْفَلَ سَافِلِيْنَ

أَسْفَلَ سَافِلِيْنَ is a phrase (شِبْهُ الجُمْلَةِ) consisting of a possessed noun followed by a possessive noun.

PhraseNoun / NounNounNoun
شِبْهُ الجُمْلَةِمُضَافٌ وَ مُضَافٌ إِلَيْهِمُضَافٌ إِلَيْهِمُضَافٌ
PhrasePossessive compoundPossessive noun/ownerNoun possessed/owned
the lowest of the lowأَسْفَلَ سَافِلِيْنَ=سَافِلِيْنَ+أَسْفَلَ
the lowest of the lowthe lowthe lowest of
Surah/Below is the only verse in the holy Quran containing the possessive phraseأَسْفَلَ سَافِلِيْنَ
Verse
95-5Then We returned him back to the lowest of the lowثُمَّ رَدَدْنَاهُ أَسْفَلَ سَافِلِيْنَ