Sahih Muslim , Book 5, Hadith 400 (In-Book) ⓘ

'Imran b. Husain reported: We were with the Messenger of Allah in a journey and we travelled throughout the night till at the end, just before dawn, we lay down (for rest), and nothing is sweeter for a traveller than this and none awakened us but the heat of the sun, and the rest of the hadith is the same (as mentioned above) except this additien:" When 'Umar b. Khattab woke up, he saw what had happened to the people. And he was a man having a big belly and strongly built; he recited takbir in a loud voice till the Messenger of Allah woke up by the loudness of his voice in takbir. When the Messenger of Allah got up, the people told him what had happened. Upon this the Messenger of Allah said: There is no harm; you better proceed further," and (the rest of the hadith) was narrated.

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الْحَنْظَلِيُّ، أَخْبَرَنَا النَّضْرُ بْنُ شُمَيْلٍ، حَدَّثَنَا عَوْفُ بْنُ أَبِي جَمِيلَةَ الأَعْرَابِيُّ، عَنْ أَبِي رَجَاءٍ الْعُطَارِدِيِّ، عَنْ عِمْرَانَ بْنِ الْحُصَيْنِ، قَالَ كُنَّا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي سَفَرٍ فَسَرَيْنَا لَيْلَةً حَتَّى إِذَا كَانَ مِنْ آخِرِ اللَّيْلِ قُبَيْلَ الصُّبْحِ وَقَعْنَا تِلْكَ الْوَقْعَةَ الَّتِي لاَ وَقْعَةَ عِنْدَ الْمُسَافِرِ أَحْلَى مِنْهَا فَمَا أَيْقَظَنَا إِلاَّ حَرُّ الشَّمْسِ ‏.‏ وَسَاقَ الْحَدِيثَ بِنَحْوِ حَدِيثِ سَلْمِ بْنِ زَرِيرٍ وَزَادَ وَنَقَصَ ‏.‏ وَقَالَ فِي الْحَدِيثِ فَلَمَّا اسْتَيْقَظَ عُمَرُ بْنُ الْخَطَّابِ وَرَأَى مَا أَصَابَ النَّاسَ وَكَانَ أَجْوَفَ جَلِيدًا فَكَبَّرَ وَرَفَعَ صَوْتَهُ بِالتَّكْبِيرِ حَتَّى اسْتَيْقَظَ رَسُولُ اللَّهِ صلى الله عليه وسلم لِشِدَّةِ صَوْتِهِ بِالتَّكْبِيرِ فَلَمَّا اسْتَيْقَظَ رَسُولُ اللَّهِ صلى الله عليه وسلم شَكَوْا إِلَيْهِ الَّذِي أَصَابَهُمْ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ لاَ ضَيْرَ ارْتَحِلُوا ‏" ‏ ‏.‏ وَاقْتَصَّ الْحَدِيثَ ‏.‏