Tafsir: Al-Fajr 89:22

وَجَاءَ رَبُّكَ وَالْمَلَكُ صَفًّا صَفًّا (and your Lord will come, and the angels as well, lined up in rows....89:22) They will arrive in the Plain of Gathering. The words 'your Lord will come' is an allegorical expression. No one, besides Allah, knows the nature of His coming. The words 'and the angels [ will arrive ] as well, lined up in rows' are clear in meaning.

وَجِيءَ يَوْمَئِذٍ بِجَهَنَّمَ ۚ يَوْمَئِذٍ يَتَذَكَّرُ الْإِنسَانُ وَأَنَّىٰ لَهُ الذِّكْرَىٰ (and Jahannam [ Hell ], on that day, will be brought forward, it will be the day when man will realise the truth, but from where will he take advantage of such realisation?.... 89:23). No one, besides Allah, knows how exactly 'Hell' will be brought forward in the Plain of Gathering. Apparently, 'Hell' which is at the moment beneath the seventh earth will at that moment will flare up, and the oceans become part of the flame. In this way, Hell during the gathering will be in front of all.