Sahih Muslim Book 30, Hadith Number 5746.

Chapter : The mercy and compassion of Allah’s Apostle (may peace be upon him) for women and his command to the camel-driver to drive the mount slowly on which they ride.

Anas b. Malik reported that Umm Sulaim was with the wives of Allah’s Apostle (may peace be upon him) and a camel-driver had been driving (the camels) oil which they were riding. Thereupon Allah’s Apostle (may peace be upon him) said: Anjasha, drive slowly, for you are carrying (on the camels) vessels of glass.