On it being disliked to hang bells from camels and other animals, and it being disliked to be accompanied by a dog or bell in a journey

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

307. Chapter: On it being disliked to hang bells from camels and other animals, and it being disliked to be accompanied by a dog or bell in a journey

1690. Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "The angels do not keep the company of any group in which there is a dog or a bell." [Muslim]

1691. Abu Hurayra said, "Bells are the flutes of Shaytan." [Muslim]