Mukhtasar Muslim (Abridged) 254 — Prohibition of announcing lost items

Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: Whoever hears someone calling out in the mosque about a lost item (that is, he raises his voice calling people for his lost thing), then he should say: May Allah not return your item to you. For indeed, mosques were not built for this purpose.