Sahih Muslim Book - 52, Hadith - 7263

وَحَدَّثَنَا عُثْمَانُ بْنُ أَبِى شَيْبَةَ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ قَالَ عُثْمَانُ حَدَّثَنَا وَقَالَ إِسْحَاقُ أَخْبَرَنَا جَرِيرٌ عَنِ الأَعْمَشِ عَنْ شَقِيقٍ عَنْ حُذَيْفَةَ قَالَ قَامَ فِينَا رَسُولُ اللَّهِ -صلى الله عليه وسلم- مَقَامًا مَا تَرَكَ شَيْئًا يَكُونُ فِى مَقَامِهِ ذَلِكَ إِلَى قِيَامِ السَّاعَةِ إِلاَّ حَدَّثَ بِهِ حَفِظَهُ مَنْ حَفِظَهُ وَنَسِيَهُ مَنْ نَسِيَهُ قَدْ عَلِمَهُ أَصْحَابِى هَؤُلاَءِ وَإِنَّهُ لَيَكُونُ مِنْهُ الشَّىْءُ قَدْ نَسِيتُهُ فَأَرَاهُ فَأَذْكُرُهُ كَمَا يَذْكُرُ الرَّجُلُ وَجْهَ الرَّجُلِ إِذَا غَابَ عَنْهُ ثُمَّ إِذَا رَآهُ عَرَفَهُ.

It was narrated that Hudhaifah said: "The Messenger of Allah (s.a.w) stood before us, and he did not omit anything that will happen before the Hour begins, but he spoke of it. Those who memorized it, memorized it, and those who forgot it, forgot it. These companions of mine know it, and if they have forgotten anything, they will recognize it if they see it, just as a man recognizes the face of a man who has been away, then when he sees him he recognizes him."