Sunan Abi Dawud Book 2, Hadith 83

I heard the Messenger of Allah (May peace be upon him) as saying; if anyone hears a man crying out in the mosque about something he has lost, he should say: May Allah not restore it to you, for the mosque were not built for this.

Previous Hadith

Abu Hurairah reported the Messenger of Allah (May peace be upon him) as saying; one shall have the thing the for which one comes to the mosque.

Sunan Abi Dawud Book 2, Hadith 82
Next Hadith

Spitting in the mosque is a sin and it is expiated by burying the spittle.

Sunan Abi Dawud Book 2, Hadith 84