وعن بريدة رضي الله عنه
أن رجلا نشد في المسجد فقال: من دعا إلى الجمل الأحمر، فقال رسول الله صلى الله عليه وسلم: «لا وجدت، إنما بنيت المساجد لم بنيت له»
A man announced (the loss of his camel) in the mosque, uttering these words: “Has any one seen my red camel?” Upon this the Messenger of Allah (sallallahu alayhi wa sallam) said, “May it not be restored to you! The mosques are built for what they are meant to be (i.e., prayer, remembrance of Allah, acquiring knowledge, etc.).”.
Riyad as-Salihin 1698, Book 18, The Book of the Prohibited actions, Hadith 188. 1 min read