Sahih Bukhari Volume 8, Book 73, Hadith Number 221.

Narated By Anas : Once Um Sulaim was (with the women who were) in charge of the luggage on a journey, and Anjashah, the slave of the Prophet, was driving their camels (very fast). The Prophet said, “O Anjash! Drive slowly (the camels) with the glass vessels (i.e., ladies).”