Musnad Abu Ya'la al-Mawsili 219:15

Shayban narrated to us, Hammam narrated to us, Nafi’ narrated to us, from Salim, from al-Jarrah, the freed slave of Umm Habibah, from Umm Habibah, that she said: I heard the Prophet, peace and blessings of Allah be upon him, saying: "A company [of travelers] in which there is a bell, the angels do not accompany it."