Sahih Bukhari Volume 4, Book 56, Hadith 3006

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، عَنْ عَبَّادِ بْنِ تَمِيمٍ، أَنَّ أَبَا بَشِيرٍ الأَنْصَارِيّ َ ـ رضى الله عنه ـ أَخْبَرَهُ أَنَّهُ، كَانَ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي بَعْضِ أَسْفَارِهِ ـ قَالَ عَبْدُ اللَّهِ حَسِبْتُ أَنَّهُ قَالَ ـ وَالنَّاسُ فِي مَبِيتِهِمْ، فَأَرْسَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم رَسُولاً أَنْ لاَ يَبْقَيَنَّ فِي رَقَبَةِ بَعِيرٍ قِلاَدَةٌ مِنْ وَتَرٍ أَوْ قِلاَدَةٌ إِلاَّ قُطِعَتْ‏

Narrated By Abu Bashir Al-Ansari : That he was in the company of Allah's Apostle on some of his journeys. (The sub-narrator 'Abdullah adds, "I think that Abu Bashir also said, 'And the people were at their sleeping places.") Allah's Apostle sent a messenger ordering: "There shall not remain any necklace of string or any other kind of necklace round the necks of camels except it is cut off."