Ahmed bin 'Ubda bin Musa أحمد بن عبدة بن موسى · The Book of Adornment

"I was sitting with Salim when a caravan belonging to Umm Al-Banin passed by us, and they had bells with them. Salim narrated to Nafi' from his father, that the Prophet said: 'The angels do not accompany a caravan that has small bells with them.' How often do you see small bells with these people."