Sahih Muslim Book 4, Hadith Number 1153.

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

Abu Huraira reported: The Messenger of Allah (may peace be upon him) said: If anyone bears a man crying out in the mosque about something lie has lost, he should say: May Allah not restore it to you, for the mosques were not built for this.