Sahih Muslim 2842
Sahih Muslim · Book 53: The Book of Paradise, its Description, its Bounties and its Inhabitants · About Hell - May Allah Protect Us From It
Abdullah b. Mas`ud reported Allah's Messenger (ﷺ) as saying:
حَدَّثَنَا عُمَرُ بْنُ حَفْصِ بْنِ غِيَاثٍ ، حَدَّثَنَا أَبِي ، عَنِ الْعَلاَءِ بْنِ خَالِدٍ الْكَاهِلِيِّ ، عَنْ شَقِيقٍ ، عَنْ عَبْدِ اللَّهِ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " يُؤْتَى بِجَهَنَّمَ يَوْمَئِذٍ لَهَا سَبْعُونَ أَلْفَ زِمَامٍ مَعَ كُلِّ زِمَامٍ سَبْعُونَ أَلْفَ مَلَكٍ يَجُرُّونَهَا " .
Hell would be brought on that day (the Day of Judgment) with seventy thousand bridles, and seventy thousand angels dragging each bridle.