Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates from Sayyidah Umm Habibah (may Allah be pleased with her) that the Prophet Muhammad (peace and blessings be upon him) said: "The angels do not accompany the camel that has a bell around its neck." (Imam Ibn Hibban, may Allah have mercy on him, says:) It is possible that by this, the Prophet Muhammad (peace and blessings be upon him) meant the camel in the caravan in which the Prophet Muhammad (peace and blessings be upon him) himself was present, because revelation used to descend upon the Prophet Muhammad (peace and blessings be upon him).