Narrated Anas ibn Malik:
Allah’s Apostle was on a journey and he had a black slave called Anjasha, and he was driving the camels (very fast, and there were women riding on those camels). Allah’s Apostle said, “Waihaka (May Allah be merciful to you), O Anjasha! Drive slowly (the camels) with the glass vessels (women)!”
[Bukhari Vol 8 Book 73, Hadith 182]