Appears 5 times in the Quran.
27:83 وَيَوْمَ نَحْشُرُ مِن كُلِّ أُمَّةٍ فَوْجًا مِّمَّن يُكَذِّبُ بِـَٔايَٰتِنَا فَهُمْ يُوزَعُونَ
And on the day when We will gather from every nation a party from among those who rejected Our communications, then they shall be formed into groups.
This is an army plunging in without consideration along with you; no welcome for them, surely they shall enter fire.
67:8 تَكَادُ تَمَيَّزُ مِنَ ٱلْغَيْظِ كُلَّمَآ أُلْقِىَ فِيهَا فَوْجٌ سَأَلَهُمْ خَزَنَتُهَآ أَلَمْ يَأْتِكُمْ نَذِيرٌ
Almost bursting for fury. Whenever a group is cast into it, its keeper shall ask them: Did there not come to you a warner?
The day on which the trumpet shall be blown so you shall come forth in hosts,
And you see men entering the religion of Allah in companies,