حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى الرَّازِيُّ، أَخْبَرَنَا عِيسَى بْنُ يُونُسَ، عَنْ ثَوْرٍ، عَنِ الْحُصَيْنِ الْحُبْرَانِيِّ، عَنْ أَبِي سَعِيدٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ مَنِ اكْتَحَلَ فَلْيُوتِرْ مَنْ فَعَلَ فَقَدْ أَحْسَنَ وَمَنْ لاَ فَلاَ حَرَجَ وَمَنِ اسْتَجْمَرَ فَلْيُوتِرْ مَنْ فَعَلَ فَقَدْ أَحْسَنَ وَمَنْ لاَ فَلاَ حَرَجَ وَمَنْ أَكَلَ فَمَا تَخَلَّلَ فَلْيَلْفِظْ وَمَا لاَكَ بِلِسَانِهِ فَلْيَبْتَلِعْ مَنْ فَعَلَ فَقَدْ أَحْسَنَ وَمَنْ لاَ فَلاَ حَرَجَ وَمَنْ أَتَى الْغَائِطَ فَلْيَسْتَتِرْ فَإِنْ لَمْ يَجِدْ إِلاَّ أَنْ يَجْمَعَ كَثِيبًا مِنْ رَمْلٍ فَلْيَسْتَدْبِرْهُ فَإِنَّ الشَّيْطَانَ يَلْعَبُ بِمَقَاعِدِ بَنِي آدَمَ مَنْ فَعَلَ فَقَدْ أَحْسَنَ وَمَنْ لاَ فَلاَ حَرَجَ ‏"‏ ‏.‏ قَالَ أَبُو دَاوُدَ رَوَاهُ أَبُو عَاصِمٍ عَنْ ثَوْرٍ قَالَ حُصَيْنٌ الْحِمْيَرِيُّ وَرَوَاهُ عَبْدُ الْمَلِكِ بْنُ الصَّبَّاحِ عَنْ ثَوْرٍ فَقَالَ أَبُو سَعِيدٍ الْخَيْرُ ‏.‏ قَالَ أَبُو دَاوُدَ أَبُو سَعِيدٍ الْخَيْرُ هُوَ مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم ‏.‏

Narrated AbuHurayrah: The Prophet (PBUH) said: If anyone applies collyrium, he should do it an odd number of times. If he does so, he has done well; but if not, there is no harm. If anyone cleanses himself with pebbles, he should use an odd number. If he does so, he has done well; but if not, there is no harm. If anyone eats, he should throw away what he removes with a toothpick and swallow what sticks to his tongue. If he does so, he has done well; if not, there is no harm. If anyone goes to relieve himself, he should conceal himself, and if all he can do is to collect a heap of send, he should sit with his back to it, for the devil makes sport with the posteriors of the children of Adam. If he does so, he has done well; but if not, there is no harm. Translation Not Available

Book reference: Sunan Abi Dawud Book 1 Hadith 35
Web reference: Sunan Abi Dawud Book 1 Hadith 35