Sahih Muslim Book 032, Hadith Number 6277.
Hadith Section/Book: Sahih Muslim Sahih Muslim Book 32. Virtues, Good Manners and Joining Of The Ties Of Relationship
Chapter : It is forbidden to curse the beasts.
'Imran reported: I perceive as if I am looking towards that dromedary, and in the hadith transmitted on the authority of Thaqafi (the words are): "Unload it and make its back bare for it is accursed."