Language:

Narrated Al-Haitham bin Abu Sinan:

that he heard Abu Huraira in his narration, mentioning that the Prophet (ﷺ) said, "A Muslim brother of yours who does not say dirty words." and by that he meant Ibn Rawaha, "said (in verse): 'We have Allah's Messenger (ﷺ) with us who recites the Holy Qur'an in the early morning time. He gave us guidance and light while we were blind and astray, so our hearts are sure that whatever he says, will certainly happen. He does not touch his bed at night, being busy in worshipping Allah while the pagans are sound asleep in their beds.' "

حَدَّثَنَا أَصْبَغُ، قَالَ أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ وَهْبٍ، قَالَ أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، أَنَّ الْهَيْثَمَ بْنَ أَبِي سِنَانٍ، أَخْبَرَهُ أَنَّهُ، سَمِعَ أَبَا هُرَيْرَةَ، فِي قَصَصِهِ يَذْكُرُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ ‏ "‏ إِنَّ أَخًا لَكُمْ لاَ يَقُولُ الرَّفَثَ ‏"‏‏.‏ يَعْنِي بِذَاكَ ابْنَ رَوَاحَةَ قَالَ فِينَا رَسُولُ اللَّهِ يَتْلُو كِتَابَهُ إِذَا انْشَقَّ مَعْرُوفٌ مِنَ الْفَجْرِ سَاطِعُ أَرَانَا الْهُدَى بَعْدَ الْعَمَى فَقُلُوبُنَا بِهِ مُوقِنَاتٌ أَنَّ مَا قَالَ وَاقِعُ يَبِيتُ يُجَافِي جَنْبَهُ عَنْ فِرَاشِهِ إِذَا اسْتَثْقَلَتْ بِالْكَافِرِينَ الْمَضَاجِعُ تَابَعَهُ عُقَيْلٌ عَنِ الزُّهْرِيِّ‏.‏ وَقَالَ الزُّبَيْدِيُّ عَنِ الزُّهْرِيِّ عَنْ سَعِيدٍ وَالأَعْرَجِ عَنْ أَبِي هُرَيْرَةَ‏.‏
Reference : Sahih al-Bukhari 6151
In-book reference : Book 78, Hadith 177
USC-MSA web (English) reference : Vol. 8, Book 73, Hadith 172
  (deprecated numbering scheme)