You are reading a tafsir for the group of verses 45:10 to 45:11
من ورايهم جهنم ولا يغني عنهم ما كسبوا شييا ولا ما اتخذوا من دون الله اولياء ولهم عذاب عظيم ١٠ هاذا هدى والذين كفروا بايات ربهم لهم عذاب من رجز اليم ١١
مِّن وَرَآئِهِمْ جَهَنَّمُ ۖ وَلَا يُغْنِى عَنْهُم مَّا كَسَبُوا۟ شَيْـًۭٔا وَلَا مَا ٱتَّخَذُوا۟ مِن دُونِ ٱللَّهِ أَوْلِيَآءَ ۖ وَلَهُمْ عَذَابٌ عَظِيمٌ ١٠ هَـٰذَا هُدًۭى ۖ وَٱلَّذِينَ كَفَرُوا۟ بِـَٔايَـٰتِ رَبِّهِمْ لَهُمْ عَذَابٌۭ مِّن رِّجْزٍ أَلِيمٌ ١١
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3

مِّن وَرَ‌ائِهِمْ جَهَنَّمُ "In front of them, there is Jahannam...45:10" The word وَرَ‌اءِ war' in Arabic is mostly used in the sense of "behind" and occasionally used in the sense of "front". Most commentators have taken the word in this context to mean ` front' and we have translated it accordingly. However, some of the commentators have taken it in this context to mean ` back/behind' and interpreted it to mean that those who are living in haughtiness and arrogance, the fire of Hell is trailing behind/after them. (Qurtubi).