Sunan an-Nasa'i, Book 13, Hadith 185 (In-Book) ⓘ

It was narrated that Anas bin Malik said: "The Messenger of Allah led us in prayer one day, then he turned to face us and said: 'I am now your imam, so do not hasten to bow or prostrate or stand or leave before I do. I can see you in front of me and behind me.' Then he said: 'By the One in Whose Hand is my soul, if you had seen what I have seen, you would laugh little and weep much.' We said: 'What have you seen, O Messenger of Allah?' He said: 'Paradise and Hell.'"

أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ، عَنِ الْمُخْتَارِ بْنِ فُلْفُلٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ صَلَّى بِنَا رَسُولُ اللَّهِ صلى الله عليه وسلم ذَاتَ يَوْمٍ ثُمَّ أَقْبَلَ عَلَيْنَا بِوَجْهِهِ فَقَالَ ‏"‏ إِنِّي إِمَامُكُمْ فَلاَ تُبَادِرُونِي بِالرُّكُوعِ وَلاَ بِالسُّجُودِ وَلاَ بِالْقِيَامِ وَلاَ بِالاِنْصِرَافِ فَإِنِّي أَرَاكُمْ مِنْ أَمَامِي وَمِنْ خَلْفِي ‏"‏ ‏.‏ ثُمَّ قَالَ ‏"‏ وَالَّذِي نَفْسِي بِيَدِهِ لَوْ رَأَيْتُمْ مَا رَأَيْتُ لَضَحِكْتُمْ قَلِيلاً وَلَبَكَيْتُمْ كَثِيرًا ‏"‏ ‏.‏ قُلْنَا مَا رَأَيْتَ يَا رَسُولَ اللَّهِ قَالَ ‏"‏ رَأَيْتُ الْجَنَّةَ وَالنَّارَ ‏"‏ ‏.‏