Qatadah narrates from Sayyiduna Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) had a camel-chanter called Anjashah, and he had a beautiful voice. He (peace and blessings be upon him) said: "O Anjashah, hold on, do not break the glass vessels."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21032