(12) باب فِي شِدَّةِ حَرِّ نَارِ جَهَنَّمَ وَبُعْدِ قَعْرِهَا وَمَا تَأْخُذُ مِنَ الْمُعَذَّبِينَ
Abu Huraira reported:
We were in the company of Allah's Messenger (ﷺ) that we heard a terrible sound. Thereupon Allah's Apostle (ﷺ) said: Do you know what (sound) is this? We said: Allah and His Messenger know best. Thereupon he said: That is a stone which was thrown seventy years before in Hell and it has'been constantly slipping down and now it has reached its base.
Reference: Sahih Muslim 2844 a
In-book reference: Book 53, Hadith 36
USC-MSA web (English) reference(deprecated numbering scheme): Book 40, Hadith 6813