Sahih Muslim Book - 50, Hadith - 7042

حَدَّثَنِى عَبَّاسُ بْنُ عَبْدِ الْعَظِيمِ الْعَنْبَرِىُّ حَدَّثَنَا أَبُو مُحَمَّدٍ النَّضْرُ بْنُ مُحَمَّدِ بْنِ مُوسَى الْيَمَامِىُّ حَدَّثَنَا عِكْرِمَةُ حَدَّثَنَا إِيَاسٌ حَدَّثَنِى أَبِى قَالَ عُدْنَا مَعَ رَسُولِ اللَّهِ -صلى الله عليه وسلم- رَجُلاً مَوْعُوكًا - قَالَ - فَوَضَعْتُ يَدِى عَلَيْهِ فَقُلْتُ وَاللَّهِ مَا رَأَيْتُ كَالْيَوْمِ رَجُلاً أَشَدَّ حَرًّا. فَقَالَ نَبِىُّ اللَّهِ -صلى الله عليه وسلم- « أَلاَ أُخْبِرُكُمْ بِأَشَدَّ حَرًّا مِنْهُ يَوْمَ الْقِيَامَةِ هَذَيْنِكَ الرَّجُلَيْنِ الرَّاكِبَيْنِ الْمُقَفِّيَيْنِ ». لِرَجُلَيْنِ حِينَئِذٍ مِنْ أَصْحَابِهِ.

Iyas said: "My father said: 'We went with the Messenger of Allah (s.a.w) to visit a man who had a fever. I put my hand on him and said: 'By Allah, I have never seen a man who is hotter than this.' The Prophet of Allah (s.a.w) said: 'Shall I not tell you of one who will be hotter than him on the Day of Resurrection?' These two men who were riding with their backs towards the Prophet (s.a.w) (heading away from him)" - referring to two men who were among his companions at that time.