Musnad Ahmad 32:1433

Yunus narrated to us, Hammad—meaning Ibn Zayd—narrated to us, from Thabit, from Anas, and Ayyub, from Abu Qilabah, from Anas ibn Malik, who said: The Messenger of Allah (may Allah bless him and grant him peace) was on a journey, and there was with him a black servant boy called Anjashah who was driving the camels (by singing). The Messenger of Allah (may Allah bless him and grant him peace) said: "Woe to you, O Anjashah, drive gently with the glass vessels." He said: And in the hadith of Abu Qilabah—meaning: the women.