Sahih Muslim Book 4, Hadith Number 1156.

Chapter : Forbiddance to eat garlic, onions and anything of offensive smell while coming to the mosque.

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.