The Book Pertaining to the Excellent Qualities of the Holy Prophet (may Peace be upon them) and His Companions (Kitab Al-Fada'il)
Muslim :: Book 30 : Hadith 5747
Anas reported that Allah's Messenger (may peace be upon him) had a camel-driver who had a very melodious voice. Allah's Messenger (may peace be upon him) said to him: Anjasha, drive slowly; do not break the vessels of glass, meaning the weak women.