Mukhtasar Bukhari

Narrated from Sayyiduna Abu Bashir Ansari (may Allah be pleased with him) that he was with the Prophet Muhammad (peace and blessings of Allah be upon him) on a journey, and the people were in their sleeping places. Then the Messenger of Allah (peace and blessings of Allah be upon him) sent a messenger that nothing, whether a string or anything else, should remain on the neck of any camel except that it be cut off.