Imam Al-Nawawi’s Riyad-us-Saliheen
Chapter 307
Undesirability of Hanging Bells round the Necks of Animals

1690. Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (sallallaahu ’alayhi wa sallam) said, “Angels do not accompany the travellers who have with them a dog or a bell.”
[Muslim].

1691. Abu Hurairah (May Allah be pleased with him) said: The Prophet (sallallaahu ’alayhi wa sallam) said, “The bell is one of the musical instruments of Satan.”
[Muslim].