The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1156
Sulaiman b. Buraida reported on the authority of his father that when the Apostle of Allah (may peace be upon him) had said prayer a man stood up and said: Who called for a red camel? (Upon this) the Apostle of Allah (may peace be upon him) said: May it not be restored to you! The mosques are built for what they are meant.