Sahih Bukhari Volume 4, Book 59, Hadith 3193

وَرَوَى عِيسَى، عَنْ رَقَبَةَ، عَنْ قَيْسِ بْنِ مُسْلِمٍ، عَنْ طَارِقِ بْنِ شِهَابٍ، قَالَ سَمِعْتُ عُمَرَ ـ رضى الله عنه ـ يَقُولُ قَامَ فِينَا النَّبِيُّ صلى الله عليه وسلم مَقَامًا، فَأَخْبَرَنَا عَنْ بَدْءِ الْخَلْقِ حَتَّى دَخَلَ أَهْلُ الْجَنَّةِ مَنَازِلَهُمْ، وَأَهْلُ النَّارِ مَنَازِلَهُمْ، حَفِظَ ذَلِكَ مَنْ حَفِظَهُ، وَنَسِيَهُ مَنْ نَسِيَهُ‏

Narrated 'Umar: One day the Prophet stood up amongst us for a long period and informed us about the beginning of creation (and talked about everything in detail) till he mentioned how the people of Paradise will enter their places and the people of Hell will enter their places. Some remembered what he had said, and some forgot it.